terminal.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <ctype.h>
   4
   5 #include <time.h>
   6 #include <assert.h>
   7 #include "putty.h"
   8 #include "terminal.h"
   9
  10 #define poslt(p1,p2) ( (p1).y < (p2).y || ( (p1).y == (p2).y && (p1).x < (p2).x ) )
  11 #define posle(p1,p2) ( (p1).y < (p2).y || ( (p1).y == (p2).y && (p1).x <= (p2).x ) )
  12 #define poseq(p1,p2) ( (p1).y == (p2).y && (p1).x == (p2).x )
  13 #define posdiff(p1,p2) ( ((p1).y - (p2).y) * (term->cols+1) + (p1).x - (p2).x )
  14
  15 /* Product-order comparisons for rectangular block selection. */
  16 #define posPlt(p1,p2) ( (p1).y <= (p2).y && (p1).x < (p2).x )
  17 #define posPle(p1,p2) ( (p1).y <= (p2).y && (p1).x <= (p2).x )
  18
  19 #define incpos(p) ( (p).x == term->cols ? ((p).x = 0, (p).y++, 1) : ((p).x++, 0) )
  20 #define decpos(p) ( (p).x == 0 ? ((p).x = term->cols, (p).y--, 1) : ((p).x--, 0) )
  21
  22 #define VT52_PLUS
  23
  24 #define CL_ANSIMIN      0x0001         /* Codes in all ANSI like terminals. */
  25 #define CL_VT100        0x0002         /* VT100 */
  26 #define CL_VT100AVO     0x0004         /* VT100 +AVO; 132x24 (not 132x14) & attrs */
  27 #define CL_VT102        0x0008         /* VT102 */
  28 #define CL_VT220        0x0010         /* VT220 */
  29 #define CL_VT320        0x0020         /* VT320 */
  30 #define CL_VT420        0x0040         /* VT420 */
  31 #define CL_VT510        0x0080         /* VT510, NB VT510 includes ANSI */
  32 #define CL_VT340TEXT    0x0100         /* VT340 extensions that appear in the VT420 */
  33 #define CL_SCOANSI      0x1000         /* SCOANSI not in ANSIMIN. */
  34 #define CL_ANSI         0x2000         /* ANSI ECMA-48 not in the VT100..VT420 */
  35 #define CL_OTHER        0x4000         /* Others, Xterm, linux, putty, dunno, etc */
  36
  37 #define TM_VT100        (CL_ANSIMIN|CL_VT100)
  38 #define TM_VT100AVO     (TM_VT100|CL_VT100AVO)
  39 #define TM_VT102        (TM_VT100AVO|CL_VT102)
  40 #define TM_VT220        (TM_VT102|CL_VT220)
  41 #define TM_VTXXX        (TM_VT220|CL_VT340TEXT|CL_VT510|CL_VT420|CL_VT320)
  42 #define TM_SCOANSI      (CL_ANSIMIN|CL_SCOANSI)
  43
  44 #define TM_PUTTY        (0xFFFF)
  45
  46 #define compatibility(x) \
  47     if ( ((CL_##x)&term->compatibility_level) == 0 ) {  \
  48        term->termstate=TOPLEVEL;                        \
  49        break;                                           \
  50     }
  51 #define compatibility2(x,y) \
  52     if ( ((CL_##x|CL_##y)&term->compatibility_level) == 0 ) { \
  53        term->termstate=TOPLEVEL;                        \
  54        break;                                           \
  55     }
  56
  57 #define has_compat(x) ( ((CL_##x)&term->compatibility_level) != 0 )
  58
  59 #define sel_nl_sz  (sizeof(sel_nl)/sizeof(wchar_t))
  60 const wchar_t sel_nl[] = SEL_NL;
  61
  62 /*
  63  * Internal prototypes.
  64  */
  65 static void do_paint(Terminal *, Context, int);
  66 static void erase_lots(Terminal *, int, int, int);
  67 static void swap_screen(Terminal *, int, int, int);
  68 static void update_sbar(Terminal *);
  69 static void deselect(Terminal *);
  70 static void term_print_finish(Terminal *);
  71 #ifdef OPTIMISE_SCROLL
  72 static void scroll_display(Terminal *, int, int, int);
  73 #endif /* OPTIMISE_SCROLL */
  74
  75 /*
  76  * Resize a line to make it `cols' columns wide.
  77  */
  78 unsigned long *resizeline(unsigned long *line, int cols)
  79 {
  80     int i, oldlen;
  81     unsigned long lineattrs;
  82
  83     if (line[0] != (unsigned long)cols) {
  84         /*
  85          * This line is the wrong length, which probably means it
  86          * hasn't been accessed since a resize. Resize it now.
  87          */
  88         oldlen = line[0];
  89         lineattrs = line[oldlen + 1];
  90         line = srealloc(line, TSIZE * (2 + cols));
  91         line[0] = cols;
  92         for (i = oldlen; i < cols; i++)
  93             line[i + 1] = ERASE_CHAR;
  94         line[cols + 1] = lineattrs & LATTR_MODE;
  95     }
  96
  97     return line;
  98 }
  99
 100 /*
 101  * Retrieve a line of the screen or of the scrollback, according to
 102  * whether the y coordinate is non-negative or negative
 103  * (respectively).
 104  */
 105 unsigned long *lineptr(Terminal *term, int y, int lineno)
 106 {
 107     unsigned long *line, *newline;
 108     tree234 *whichtree;
 109     int treeindex;
 110
 111     if (y >= 0) {
 112         whichtree = term->screen;
 113         treeindex = y;
 114     } else {
 115         whichtree = term->scrollback;
 116         treeindex = y + count234(term->scrollback);
 117     }
 118     line = index234(whichtree, treeindex);
 119
 120     /* We assume that we don't screw up and retrieve something out of range. */
 121     assert(line != NULL);
 122
 123     newline = resizeline(line, term->cols);
 124     if (newline != line) {
 125         delpos234(whichtree, treeindex);
 126         addpos234(whichtree, newline, treeindex);
 127         line = newline;
 128     }
 129
 130     return line + 1;
 131 }
 132
 133 #define lineptr(x) lineptr(term,x,__LINE__)
 134
 135 /*
 136  * Set up power-on settings for the terminal.
 137  */
 138 static void power_on(Terminal *term)
 139 {
 140     term->curs.x = term->curs.y = 0;
 141     term->alt_x = term->alt_y = 0;
 142     term->savecurs.x = term->savecurs.y = 0;
 143     term->alt_t = term->marg_t = 0;
 144     if (term->rows != -1)
 145         term->alt_b = term->marg_b = term->rows - 1;
 146     else
 147         term->alt_b = term->marg_b = 0;
 148     if (term->cols != -1) {
 149         int i;
 150         for (i = 0; i < term->cols; i++)
 151             term->tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
 152     }
 153     term->alt_om = term->dec_om = term->cfg->dec_om;
 154     term->alt_ins = term->insert = FALSE;
 155     term->alt_wnext = term->wrapnext = term->save_wnext = FALSE;
 156     term->alt_wrap = term->wrap = term->cfg->wrap_mode;
 157     term->alt_cset = term->cset = term->save_cset = 0;
 158     term->alt_utf = term->utf = term->save_utf = 0;
 159     term->utf_state = 0;
 160     term->alt_sco_acs = term->sco_acs = term->save_sco_acs = 0;
 161     term->cset_attr[0] = term->cset_attr[1] = term->save_csattr = ATTR_ASCII;
 162     term->rvideo = 0;
 163     term->in_vbell = FALSE;
 164     term->cursor_on = 1;
 165     term->big_cursor = 0;
 166     term->save_attr = term->curr_attr = ATTR_DEFAULT;
 167     term->term_editing = term->term_echoing = FALSE;
 168     term->app_cursor_keys = term->cfg->app_cursor;
 169     term->app_keypad_keys = term->cfg->app_keypad;
 170     term->use_bce = term->cfg->bce;
 171     term->blink_is_real = term->cfg->blinktext;
 172     term->erase_char = ERASE_CHAR;
 173     term->alt_which = 0;
 174     term_print_finish(term);
 175     {
 176         int i;
 177         for (i = 0; i < 256; i++)
 178             term->wordness[i] = term->cfg->wordness[i];
 179     }
 180     if (term->screen) {
 181         swap_screen(term, 1, FALSE, FALSE);
 182         erase_lots(term, FALSE, TRUE, TRUE);
 183         swap_screen(term, 0, FALSE, FALSE);
 184         erase_lots(term, FALSE, TRUE, TRUE);
 185     }
 186 }
 187
 188 /*
 189  * Force a screen update.
 190  */
 191 void term_update(Terminal *term)
 192 {
 193     Context ctx;
 194     ctx = get_ctx(term->frontend);
 195     if (ctx) {
 196         int need_sbar_update = term->seen_disp_event;
 197         if (term->seen_disp_event && term->cfg->scroll_on_disp) {
 198             term->disptop = 0;         /* return to main screen */
 199             term->seen_disp_event = 0;
 200             need_sbar_update = TRUE;
 201         }
 202         if (need_sbar_update)
 203             update_sbar(term);
 204         do_paint(term, ctx, TRUE);
 205         sys_cursor(term->frontend, term->curs.x, term->curs.y - term->disptop);
 206         free_ctx(ctx);
 207     }
 208 }
 209
 210 /*
 211  * Called from front end when a keypress occurs, to trigger
 212  * anything magical that needs to happen in that situation.
 213  */
 214 void term_seen_key_event(Terminal *term)
 215 {
 216     /*
 217      * On any keypress, clear the bell overload mechanism
 218      * completely, on the grounds that large numbers of
 219      * beeps coming from deliberate key action are likely
 220      * to be intended (e.g. beeps from filename completion
 221      * blocking repeatedly).
 222      */
 223     term->beep_overloaded = FALSE;
 224     while (term->beephead) {
 225         struct beeptime *tmp = term->beephead;
 226         term->beephead = tmp->next;
 227         sfree(tmp);
 228     }
 229     term->beeptail = NULL;
 230     term->nbeeps = 0;
 231
 232     /*
 233      * Reset the scrollback on keypress, if we're doing that.
 234      */
 235     if (term->cfg->scroll_on_key) {
 236         term->disptop = 0;             /* return to main screen */
 237         term->seen_disp_event = 1;
 238     }
 239 }
 240
 241 /*
 242  * Same as power_on(), but an external function.
 243  */
 244 void term_pwron(Terminal *term)
 245 {
 246     power_on(term);
 247     if (term->ldisc)                   /* cause ldisc to notice changes */
 248         ldisc_send(term->ldisc, NULL, 0, 0);
 249     fix_cpos;
 250     term->disptop = 0;
 251     deselect(term);
 252     term_update(term);
 253 }
 254
 255 /*
 256  * When the user reconfigures us, we need to check the forbidden-
 257  * alternate-screen config option, disable raw mouse mode if the
 258  * user has disabled mouse reporting, and abandon a print job if
 259  * the user has disabled printing.
 260  */
 261 void term_reconfig(Terminal *term)
 262 {
 263     if (term->cfg->no_alt_screen)
 264         swap_screen(term, 0, FALSE, FALSE);
 265     if (term->cfg->no_mouse_rep) {
 266         term->xterm_mouse = 0;
 267         set_raw_mouse_mode(term->frontend, 0);
 268     }
 269     if (term->cfg->no_remote_charset) {
 270         term->cset_attr[0] = term->cset_attr[1] = ATTR_ASCII;
 271         term->sco_acs = term->alt_sco_acs = 0;
 272         term->utf = 0;
 273     }
 274     if (!*term->cfg->printer) {
 275         term_print_finish(term);
 276     }
 277 }
 278
 279 /*
 280  * Clear the scrollback.
 281  */
 282 void term_clrsb(Terminal *term)
 283 {
 284     unsigned long *line;
 285     term->disptop = 0;
 286     while ((line = delpos234(term->scrollback, 0)) != NULL) {
 287         sfree(line);
 288     }
 289     update_sbar(term);
 290 }
 291
 292 /*
 293  * Initialise the terminal.
 294  */
 295 Terminal *term_init(Config *mycfg, void *frontend)
 296 {
 297     Terminal *term;
 298
 299     /*
 300      * Allocate a new Terminal structure and initialise the fields
 301      * that need it.
 302      */
 303     term = smalloc(sizeof(Terminal));
 304     term->frontend = frontend;
 305     term->cfg = mycfg;
 306     term->logctx = NULL;
 307     term->compatibility_level = TM_PUTTY;
 308     strcpy(term->id_string, "\033[?6c");
 309     term->last_blink = term->last_tblink = 0;
 310     term->paste_buffer = NULL;
 311     term->last_paste = 0;
 312     bufchain_init(&term->inbuf);
 313     bufchain_init(&term->printer_buf);
 314     term->printing = term->only_printing = FALSE;
 315     term->print_job = NULL;
 316     term->vt52_mode = FALSE;
 317     term->cr_lf_return = FALSE;
 318     term->seen_disp_event = FALSE;
 319     term->xterm_mouse = term->mouse_is_down = FALSE;
 320     term->reset_132 = FALSE;
 321     term->blinker = term->tblinker = 0;
 322     term->has_focus = 1;
 323     term->repeat_off = FALSE;
 324     term->termstate = TOPLEVEL;
 325     term->selstate = NO_SELECTION;
 326     term->curstype = 0;
 327
 328     term->screen = term->alt_screen = term->scrollback = NULL;
 329     term->disptop = 0;
 330     term->disptext = term->dispcurs = NULL;
 331     term->tabs = NULL;
 332     deselect(term);
 333     term->rows = term->cols = -1;
 334     power_on(term);
 335     term->beephead = term->beeptail = NULL;
 336     term->nbeeps = 0;
 337     term->lastbeep = FALSE;
 338     term->beep_overloaded = FALSE;
 339     term->resize_fn = NULL;
 340     term->resize_ctx = NULL;
 341
 342     return term;
 343 }
 344
 345 /*
 346  * Set up the terminal for a given size.
 347  */
 348 void term_size(Terminal *term, int newrows, int newcols, int newsavelines)
 349 {
 350     tree234 *newalt;
 351     unsigned long *newdisp, *line;
 352     int i, j;
 353     int sblen;
 354     int save_alt_which = term->alt_which;
 355
 356     if (newrows == term->rows && newcols == term->cols &&
 357         newsavelines == term->savelines)
 358         return;                        /* nothing to do */
 359
 360     deselect(term);
 361     swap_screen(term, 0, FALSE, FALSE);
 362
 363     term->alt_t = term->marg_t = 0;
 364     term->alt_b = term->marg_b = newrows - 1;
 365
 366     if (term->rows == -1) {
 367         term->scrollback = newtree234(NULL);
 368         term->screen = newtree234(NULL);
 369         term->rows = 0;
 370     }
 371
 372     /*
 373      * Resize the screen and scrollback. We only need to shift
 374      * lines around within our data structures, because lineptr()
 375      * will take care of resizing each individual line if
 376      * necessary. So:
 377      *
 378      *  - If the new screen and the old screen differ in length, we
 379      *    must shunt some lines in from the scrollback or out to
 380      *    the scrollback.
 381      *
 382      *  - If doing that fails to provide us with enough material to
 383      *    fill the new screen (i.e. the number of rows needed in
 384      *    the new screen exceeds the total number in the previous
 385      *    screen+scrollback), we must invent some blank lines to
 386      *    cover the gap.
 387      *
 388      *  - Then, if the new scrollback length is less than the
 389      *    amount of scrollback we actually have, we must throw some
 390      *    away.
 391      */
 392     sblen = count234(term->scrollback);
 393     /* Do this loop to expand the screen if newrows > rows */
 394     for (i = term->rows; i < newrows; i++) {
 395         if (sblen > 0) {
 396             line = delpos234(term->scrollback, --sblen);
 397         } else {
 398             line = smalloc(TSIZE * (newcols + 2));
 399             line[0] = newcols;
 400             for (j = 0; j <= newcols; j++)
 401                 line[j + 1] = ERASE_CHAR;
 402         }
 403         addpos234(term->screen, line, 0);
 404     }
 405     /* Do this loop to shrink the screen if newrows < rows */
 406     for (i = newrows; i < term->rows; i++) {
 407         line = delpos234(term->screen, 0);
 408         addpos234(term->scrollback, line, sblen++);
 409     }
 410     assert(count234(term->screen) == newrows);
 411     while (sblen > newsavelines) {
 412         line = delpos234(term->scrollback, 0);
 413         sfree(line);
 414         sblen--;
 415     }
 416     assert(count234(term->scrollback) <= newsavelines);
 417     term->disptop = 0;
 418
 419     newdisp = smalloc(newrows * (newcols + 1) * TSIZE);
 420     for (i = 0; i < newrows * (newcols + 1); i++)
 421         newdisp[i] = ATTR_INVALID;
 422     sfree(term->disptext);
 423     term->disptext = newdisp;
 424     term->dispcurs = NULL;
 425
 426     newalt = newtree234(NULL);
 427     for (i = 0; i < newrows; i++) {
 428         line = smalloc(TSIZE * (newcols + 2));
 429         line[0] = newcols;
 430         for (j = 0; j <= newcols; j++)
 431             line[j + 1] = term->erase_char;
 432         addpos234(newalt, line, i);
 433     }
 434     if (term->alt_screen) {
 435         while (NULL != (line = delpos234(term->alt_screen, 0)))
 436             sfree(line);
 437         freetree234(term->alt_screen);
 438     }
 439     term->alt_screen = newalt;
 440
 441     term->tabs = srealloc(term->tabs, newcols * sizeof(*term->tabs));
 442     {
 443         int i;
 444         for (i = (term->cols > 0 ? term->cols : 0); i < newcols; i++)
 445             term->tabs[i] = (i % 8 == 0 ? TRUE : FALSE);
 446     }
 447
 448     if (term->rows > 0)
 449         term->curs.y += newrows - term->rows;
 450     if (term->curs.y < 0)
 451         term->curs.y = 0;
 452     if (term->curs.y >= newrows)
 453         term->curs.y = newrows - 1;
 454     if (term->curs.x >= newcols)
 455         term->curs.x = newcols - 1;
 456     term->alt_x = term->alt_y = 0;
 457     term->wrapnext = term->alt_wnext = FALSE;
 458
 459     term->rows = newrows;
 460     term->cols = newcols;
 461     term->savelines = newsavelines;
 462     fix_cpos;
 463
 464     swap_screen(term, save_alt_which, FALSE, FALSE);
 465
 466     update_sbar(term);
 467     term_update(term);
 468     if (term->resize_fn)
 469         term->resize_fn(term->resize_ctx, term->cols, term->rows);
 470 }
 471
 472 /*
 473  * Hand a function and context pointer to the terminal which it can
 474  * use to notify a back end of resizes.
 475  */
 476 void term_provide_resize_fn(Terminal *term,
 477                             void (*resize_fn)(void *, int, int),
 478                             void *resize_ctx)
 479 {
 480     term->resize_fn = resize_fn;
 481     term->resize_ctx = resize_ctx;
 482     if (term->cols > 0 && term->rows > 0)
 483         resize_fn(resize_ctx, term->cols, term->rows);
 484 }
 485
 486 /*
 487  * Swap screens. If `reset' is TRUE and we have been asked to
 488  * switch to the alternate screen, we must bring most of its
 489  * configuration from the main screen and erase the contents of the
 490  * alternate screen completely. (This is even true if we're already
 491  * on it! Blame xterm.)
 492  */
 493 static void swap_screen(Terminal *term, int which, int reset, int keep_cur_pos)
 494 {
 495     int t;
 496     tree234 *ttr;
 497
 498     if (!which)
 499         reset = FALSE;                 /* do no weird resetting if which==0 */
 500
 501     if (which != term->alt_which) {
 502         term->alt_which = which;
 503
 504         ttr = term->alt_screen;
 505         term->alt_screen = term->screen;
 506         term->screen = ttr;
 507         t = term->curs.x;
 508         if (!reset && !keep_cur_pos)
 509             term->curs.x = term->alt_x;
 510         term->alt_x = t;
 511         t = term->curs.y;
 512         if (!reset && !keep_cur_pos)
 513             term->curs.y = term->alt_y;
 514         term->alt_y = t;
 515         t = term->marg_t;
 516         if (!reset) term->marg_t = term->alt_t;
 517         term->alt_t = t;
 518         t = term->marg_b;
 519         if (!reset) term->marg_b = term->alt_b;
 520         term->alt_b = t;
 521         t = term->dec_om;
 522         if (!reset) term->dec_om = term->alt_om;
 523         term->alt_om = t;
 524         t = term->wrap;
 525         if (!reset) term->wrap = term->alt_wrap;
 526         term->alt_wrap = t;
 527         t = term->wrapnext;
 528         if (!reset) term->wrapnext = term->alt_wnext;
 529         term->alt_wnext = t;
 530         t = term->insert;
 531         if (!reset) term->insert = term->alt_ins;
 532         term->alt_ins = t;
 533         t = term->cset;
 534         if (!reset) term->cset = term->alt_cset;
 535         term->alt_cset = t;
 536         t = term->utf;
 537         if (!reset) term->utf = term->alt_utf;
 538         term->alt_utf = t;
 539         t = term->sco_acs;
 540         if (!reset) term->sco_acs = term->alt_sco_acs;
 541         term->alt_sco_acs = t;
 542     }
 543
 544     if (reset && term->screen) {
 545         /*
 546          * Yes, this _is_ supposed to honour background-colour-erase.
 547          */
 548         erase_lots(term, FALSE, TRUE, TRUE);
 549     }
 550
 551     /*
 552      * This might not be possible if we're called during
 553      * initialisation.
 554      */
 555     if (term->screen)
 556         fix_cpos;
 557 }
 558
 559 /*
 560  * Update the scroll bar.
 561  */
 562 static void update_sbar(Terminal *term)
 563 {
 564     int nscroll;
 565
 566     nscroll = count234(term->scrollback);
 567
 568     set_sbar(term->frontend, nscroll + term->rows,
 569              nscroll + term->disptop, term->rows);
 570 }
 571
 572 /*
 573  * Check whether the region bounded by the two pointers intersects
 574  * the scroll region, and de-select the on-screen selection if so.
 575  */
 576 static void check_selection(Terminal *term, pos from, pos to)
 577 {
 578     if (poslt(from, term->selend) && poslt(term->selstart, to))
 579         deselect(term);
 580 }
 581
 582 /*
 583  * Scroll the screen. (`lines' is +ve for scrolling forward, -ve
 584  * for backward.) `sb' is TRUE if the scrolling is permitted to
 585  * affect the scrollback buffer.
 586  *
 587  * NB this function invalidates all pointers into lines of the
 588  * screen data structures. In particular, you MUST call fix_cpos
 589  * after calling scroll() and before doing anything else that
 590  * uses the cpos shortcut pointer.
 591  */
 592 static void scroll(Terminal *term, int topline, int botline, int lines, int sb)
 593 {
 594     unsigned long *line, *line2;
 595     int i, seltop;
 596
 597     if (topline != 0 || term->alt_which != 0)
 598         sb = FALSE;
 599
 600     if (lines < 0) {
 601         while (lines < 0) {
 602             line = delpos234(term->screen, botline);
 603             line = resizeline(line, term->cols);
 604             for (i = 0; i < term->cols; i++)
 605                 line[i + 1] = term->erase_char;
 606             line[term->cols + 1] = 0;
 607             addpos234(term->screen, line, topline);
 608
 609             if (term->selstart.y >= topline && term->selstart.y <= botline) {
 610                 term->selstart.y++;
 611                 if (term->selstart.y > botline) {
 612                     term->selstart.y = botline;
 613                     term->selstart.x = 0;
 614                 }
 615             }
 616             if (term->selend.y >= topline && term->selend.y <= botline) {
 617                 term->selend.y++;
 618                 if (term->selend.y > botline) {
 619                     term->selend.y = botline;
 620                     term->selend.x = 0;
 621                 }
 622             }
 623
 624             lines++;
 625         }
 626     } else {
 627         while (lines > 0) {
 628             line = delpos234(term->screen, topline);
 629             if (sb && term->savelines > 0) {
 630                 int sblen = count234(term->scrollback);
 631                 /*
 632                  * We must add this line to the scrollback. We'll
 633                  * remove a line from the top of the scrollback to
 634                  * replace it, or allocate a new one if the
 635                  * scrollback isn't full.
 636                  */
 637                 if (sblen == term->savelines) {
 638                     sblen--, line2 = delpos234(term->scrollback, 0);
 639                 } else {
 640                     line2 = smalloc(TSIZE * (term->cols + 2));
 641                     line2[0] = term->cols;
 642                 }
 643                 addpos234(term->scrollback, line, sblen);
 644                 line = line2;
 645
 646                 /*
 647                  * If the user is currently looking at part of the
 648                  * scrollback, and they haven't enabled any options
 649                  * that are going to reset the scrollback as a
 650                  * result of this movement, then the chances are
 651                  * they'd like to keep looking at the same line. So
 652                  * we move their viewpoint at the same rate as the
 653                  * scroll, at least until their viewpoint hits the
 654                  * top end of the scrollback buffer, at which point
 655                  * we don't have the choice any more.
 656                  *
 657                  * Thanks to Jan Holmen Holsten for the idea and
 658                  * initial implementation.
 659                  */
 660                 if (term->disptop > -term->savelines && term->disptop < 0)
 661                     term->disptop--;
 662             }
 663             line = resizeline(line, term->cols);
 664             for (i = 0; i < term->cols; i++)
 665                 line[i + 1] = term->erase_char;
 666             line[term->cols + 1] = 0;
 667             addpos234(term->screen, line, botline);
 668
 669             /*
 670              * If the selection endpoints move into the scrollback,
 671              * we keep them moving until they hit the top. However,
 672              * of course, if the line _hasn't_ moved into the
 673              * scrollback then we don't do this, and cut them off
 674              * at the top of the scroll region.
 675              *
 676              * This applies to selstart and selend (for an existing
 677              * selection), and also selanchor (for one being
 678              * selected as we speak).
 679              */
 680             seltop = sb ? -term->savelines : topline;
 681
 682             if (term->selstart.y >= seltop &&
 683                 term->selstart.y <= botline) {
 684                 term->selstart.y--;
 685                 if (term->selstart.y < seltop) {
 686                     term->selstart.y = seltop;
 687                     term->selstart.x = 0;
 688                 }
 689             }
 690             if (term->selend.y >= seltop && term->selend.y <= botline) {
 691                 term->selend.y--;
 692                 if (term->selend.y < seltop) {
 693                     term->selend.y = seltop;
 694                     term->selend.x = 0;
 695                 }
 696             }
 697             if (term->selanchor.y >= seltop && term->selanchor.y <= botline) {
 698                 term->selanchor.y--;
 699                 if (term->selanchor.y < seltop) {
 700                     term->selanchor.y = seltop;
 701                     term->selanchor.x = 0;
 702                 }
 703             }
 704
 705             lines--;
 706         }
 707     }
 708 }
 709
 710 #ifdef OPTIMISE_SCROLL
 711 /*
 712  * Scroll the physical display, and our conception of it in disptext.
 713  */
 714 static void scroll_display(Terminal *term, int topline, int botline, int lines)
 715 {
 716     unsigned long *start, *end;
 717     int distance, size, i;
 718
 719     start = term->disptext + topline * (term->cols + 1);
 720     end = term->disptext + (botline + 1) * (term->cols + 1);
 721     distance = (lines > 0 ? lines : -lines) * (term->cols + 1);
 722     size = end - start - distance;
 723     if (lines > 0) {
 724         memmove(start, start + distance, size * TSIZE);
 725         for (i = 0; i < distance; i++)
 726             (start + size)[i] |= ATTR_INVALID;
 727     } else {
 728         memmove(start + distance, start, size * TSIZE);
 729         for (i = 0; i < distance; i++)
 730             start[i] |= ATTR_INVALID;
 731     }
 732     do_scroll(term->frontend, topline, botline, lines);
 733 }
 734 #endif /* OPTIMISE_SCROLL */
 735
 736 /*
 737  * Move the cursor to a given position, clipping at boundaries. We
 738  * may or may not want to clip at the scroll margin: marg_clip is 0
 739  * not to, 1 to disallow _passing_ the margins, and 2 to disallow
 740  * even _being_ outside the margins.
 741  */
 742 static void move(Terminal *term, int x, int y, int marg_clip)
 743 {
 744     if (x < 0)
 745         x = 0;
 746     if (x >= term->cols)
 747         x = term->cols - 1;
 748     if (marg_clip) {
 749         if ((term->curs.y >= term->marg_t || marg_clip == 2) &&
 750             y < term->marg_t)
 751             y = term->marg_t;
 752         if ((term->curs.y <= term->marg_b || marg_clip == 2) &&
 753             y > term->marg_b)
 754             y = term->marg_b;
 755     }
 756     if (y < 0)
 757         y = 0;
 758     if (y >= term->rows)
 759         y = term->rows - 1;
 760     term->curs.x = x;
 761     term->curs.y = y;
 762     fix_cpos;
 763     term->wrapnext = FALSE;
 764 }
 765
 766 /*
 767  * Save or restore the cursor and SGR mode.
 768  */
 769 static void save_cursor(Terminal *term, int save)
 770 {
 771     if (save) {
 772         term->savecurs = term->curs;
 773         term->save_attr = term->curr_attr;
 774         term->save_cset = term->cset;
 775         term->save_utf = term->utf;
 776         term->save_wnext = term->wrapnext;
 777         term->save_csattr = term->cset_attr[term->cset];
 778         term->save_sco_acs = term->sco_acs;
 779     } else {
 780         term->curs = term->savecurs;
 781         /* Make sure the window hasn't shrunk since the save */
 782         if (term->curs.x >= term->cols)
 783             term->curs.x = term->cols - 1;
 784         if (term->curs.y >= term->rows)
 785             term->curs.y = term->rows - 1;
 786
 787         term->curr_attr = term->save_attr;
 788         term->cset = term->save_cset;
 789         term->utf = term->save_utf;
 790         term->wrapnext = term->save_wnext;
 791         /*
 792          * wrapnext might reset to False if the x position is no
 793          * longer at the rightmost edge.
 794          */
 795         if (term->wrapnext && term->curs.x < term->cols-1)
 796             term->wrapnext = FALSE;
 797         term->cset_attr[term->cset] = term->save_csattr;
 798         term->sco_acs = term->save_sco_acs;
 799         fix_cpos;
 800         if (term->use_bce)
 801             term->erase_char = (' ' | ATTR_ASCII |
 802                                 (term->curr_attr &
 803                                  (ATTR_FGMASK | ATTR_BGMASK)));
 804     }
 805 }
 806
 807 /*
 808  * Erase a large portion of the screen: the whole screen, or the
 809  * whole line, or parts thereof.
 810  */
 811 static void erase_lots(Terminal *term,
 812                        int line_only, int from_begin, int to_end)
 813 {
 814     pos start, end;
 815     int erase_lattr;
 816     unsigned long *ldata;
 817
 818     if (line_only) {
 819         start.y = term->curs.y;
 820         start.x = 0;
 821         end.y = term->curs.y + 1;
 822         end.x = 0;
 823         erase_lattr = FALSE;
 824     } else {
 825         start.y = 0;
 826         start.x = 0;
 827         end.y = term->rows;
 828         end.x = 0;
 829         erase_lattr = TRUE;
 830     }
 831     if (!from_begin) {
 832         start = term->curs;
 833     }
 834     if (!to_end) {
 835         end = term->curs;
 836         incpos(end);
 837     }
 838     check_selection(term, start, end);
 839
 840     /* Clear screen also forces a full window redraw, just in case. */
 841     if (start.y == 0 && start.x == 0 && end.y == term->rows)
 842         term_invalidate(term);
 843
 844     ldata = lineptr(start.y);
 845     while (poslt(start, end)) {
 846         if (start.x == term->cols && !erase_lattr)
 847             ldata[start.x] &= ~LATTR_WRAPPED;
 848         else
 849             ldata[start.x] = term->erase_char;
 850         if (incpos(start) && start.y < term->rows)
 851             ldata = lineptr(start.y);
 852     }
 853 }
 854
 855 /*
 856  * Insert or delete characters within the current line. n is +ve if
 857  * insertion is desired, and -ve for deletion.
 858  */
 859 static void insch(Terminal *term, int n)
 860 {
 861     int dir = (n < 0 ? -1 : +1);
 862     int m;
 863     pos cursplus;
 864     unsigned long *ldata;
 865
 866     n = (n < 0 ? -n : n);
 867     if (n > term->cols - term->curs.x)
 868         n = term->cols - term->curs.x;
 869     m = term->cols - term->curs.x - n;
 870     cursplus.y = term->curs.y;
 871     cursplus.x = term->curs.x + n;
 872     check_selection(term, term->curs, cursplus);
 873     ldata = lineptr(term->curs.y);
 874     if (dir < 0) {
 875         memmove(ldata + term->curs.x, ldata + term->curs.x + n, m * TSIZE);
 876         while (n--)
 877             ldata[term->curs.x + m++] = term->erase_char;
 878     } else {
 879         memmove(ldata + term->curs.x + n, ldata + term->curs.x, m * TSIZE);
 880         while (n--)
 881             ldata[term->curs.x + n] = term->erase_char;
 882     }
 883 }
 884
 885 /*
 886  * Toggle terminal mode `mode' to state `state'. (`query' indicates
 887  * whether the mode is a DEC private one or a normal one.)
 888  */
 889 static void toggle_mode(Terminal *term, int mode, int query, int state)
 890 {
 891     unsigned long ticks;
 892
 893     if (query)
 894         switch (mode) {
 895           case 1:                      /* application cursor keys */
 896             term->app_cursor_keys = state;
 897             break;
 898           case 2:                      /* VT52 mode */
 899             term->vt52_mode = !state;
 900             if (term->vt52_mode) {
 901                 term->blink_is_real = FALSE;
 902                 term->vt52_bold = FALSE;
 903             } else {
 904                 term->blink_is_real = term->cfg->blinktext;
 905             }
 906             break;
 907           case 3:                      /* 80/132 columns */
 908             deselect(term);
 909             if (!term->cfg->no_remote_resize)
 910                 request_resize(term->frontend, state ? 132 : 80, term->rows);
 911             term->reset_132 = state;
 912             break;
 913           case 5:                      /* reverse video */
 914             /*
 915              * Toggle reverse video. If we receive an OFF within the
 916              * visual bell timeout period after an ON, we trigger an
 917              * effective visual bell, so that ESC[?5hESC[?5l will
 918              * always be an actually _visible_ visual bell.
 919              */
 920             ticks = GETTICKCOUNT();
 921             /* turn off a previous vbell to avoid inconsistencies */
 922             if (ticks - term->vbell_startpoint >= VBELL_TIMEOUT)
 923                 term->in_vbell = FALSE;
 924             if (term->rvideo && !state &&    /* we're turning it off... */
 925                 (ticks - term->rvbell_startpoint) < VBELL_TIMEOUT) {/*...soon*/
 926                 /* If there's no vbell timeout already, or this one lasts
 927                  * longer, replace vbell_timeout with ours. */
 928                 if (!term->in_vbell ||
 929                     (term->rvbell_startpoint - term->vbell_startpoint <
 930                      VBELL_TIMEOUT))
 931                     term->vbell_startpoint = term->rvbell_startpoint;
 932                 term->in_vbell = TRUE; /* may clear rvideo but set in_vbell */
 933             } else if (!term->rvideo && state) {
 934                 /* This is an ON, so we notice the time and save it. */
 935                 term->rvbell_startpoint = ticks;
 936             }
 937             term->rvideo = state;
 938             term->seen_disp_event = TRUE;
 939             if (state)
 940                 term_update(term);
 941             break;
 942           case 6:                      /* DEC origin mode */
 943             term->dec_om = state;
 944             break;
 945           case 7:                      /* auto wrap */
 946             term->wrap = state;
 947             break;
 948           case 8:                      /* auto key repeat */
 949             term->repeat_off = !state;
 950             break;
 951           case 10:                     /* set local edit mode */
 952             term->term_editing = state;
 953             if (term->ldisc)           /* cause ldisc to notice changes */
 954                 ldisc_send(term->ldisc, NULL, 0, 0);
 955             break;
 956           case 25:                     /* enable/disable cursor */
 957             compatibility2(OTHER, VT220);
 958             term->cursor_on = state;
 959             term->seen_disp_event = TRUE;
 960             break;
 961           case 47:                     /* alternate screen */
 962             compatibility(OTHER);
 963             deselect(term);
 964             swap_screen(term, term->cfg->no_alt_screen ? 0 : state, FALSE, FALSE);
 965             term->disptop = 0;
 966             break;
 967           case 1000:                   /* xterm mouse 1 */
 968             term->xterm_mouse = state ? 1 : 0;
 969             set_raw_mouse_mode(term->frontend, state);
 970             break;
 971           case 1002:                   /* xterm mouse 2 */
 972             term->xterm_mouse = state ? 2 : 0;
 973             set_raw_mouse_mode(term->frontend, state);
 974             break;
 975           case 1047:                   /* alternate screen */
 976             compatibility(OTHER);
 977             deselect(term);
 978             swap_screen(term, term->cfg->no_alt_screen ? 0 : state, TRUE, TRUE);
 979             term->disptop = 0;
 980             break;
 981           case 1048:                   /* save/restore cursor */
 982             save_cursor(term, state);
 983             if (!state) term->seen_disp_event = TRUE;
 984             break;
 985           case 1049:                   /* cursor & alternate screen */
 986             if (state)
 987                 save_cursor(term, state);
 988             if (!state) term->seen_disp_event = TRUE;
 989             compatibility(OTHER);
 990             deselect(term);
 991             swap_screen(term, term->cfg->no_alt_screen ? 0 : state, TRUE, FALSE);
 992             if (!state)
 993                 save_cursor(term, state);
 994             term->disptop = 0;
 995             break;
 996     } else
 997         switch (mode) {
 998           case 4:                      /* set insert mode */
 999             compatibility(VT102);
1000             term->insert = state;
1001             break;
1002           case 12:                     /* set echo mode */
1003             term->term_echoing = !state;
1004             if (term->ldisc)           /* cause ldisc to notice changes */
1005                 ldisc_send(term->ldisc, NULL, 0, 0);
1006             break;
1007           case 20:                     /* Return sends ... */
1008             term->cr_lf_return = state;
1009             break;
1010           case 34:                     /* Make cursor BIG */
1011             compatibility2(OTHER, VT220);
1012             term->big_cursor = !state;
1013         }
1014 }
1015
1016 /*
1017  * Process an OSC sequence: set window title or icon name.
1018  */
1019 static void do_osc(Terminal *term)
1020 {
1021     if (term->osc_w) {
1022         while (term->osc_strlen--)
1023             term->wordness[(unsigned char)
1024                 term->osc_string[term->osc_strlen]] = term->esc_args[0];
1025     } else {
1026         term->osc_string[term->osc_strlen] = '\0';
1027         switch (term->esc_args[0]) {
1028           case 0:
1029           case 1:
1030             if (!term->cfg->no_remote_wintitle)
1031                 set_icon(term->frontend, term->osc_string);
1032             if (term->esc_args[0] == 1)
1033                 break;
1034             /* fall through: parameter 0 means set both */
1035           case 2:
1036           case 21:
1037             if (!term->cfg->no_remote_wintitle)
1038                 set_title(term->frontend, term->osc_string);
1039             break;
1040         }
1041     }
1042 }
1043
1044 /*
1045  * ANSI printing routines.
1046  */
1047 static void term_print_setup(Terminal *term)
1048 {
1049     bufchain_clear(&term->printer_buf);
1050     term->print_job = printer_start_job(term->cfg->printer);
1051 }
1052 static void term_print_flush(Terminal *term)
1053 {
1054     void *data;
1055     int len;
1056     int size;
1057     while ((size = bufchain_size(&term->printer_buf)) > 5) {
1058         bufchain_prefix(&term->printer_buf, &data, &len);
1059         if (len > size-5)
1060             len = size-5;
1061         printer_job_data(term->print_job, data, len);
1062         bufchain_consume(&term->printer_buf, len);
1063     }
1064 }
1065 static void term_print_finish(Terminal *term)
1066 {
1067     void *data;
1068     int len, size;
1069     char c;
1070
1071     if (!term->printing && !term->only_printing)
1072         return;                        /* we need do nothing */
1073
1074     term_print_flush(term);
1075     while ((size = bufchain_size(&term->printer_buf)) > 0) {
1076         bufchain_prefix(&term->printer_buf, &data, &len);
1077         c = *(char *)data;
1078         if (c == '\033' || c == '\233') {
1079             bufchain_consume(&term->printer_buf, size);
1080             break;
1081         } else {
1082             printer_job_data(term->print_job, &c, 1);
1083             bufchain_consume(&term->printer_buf, 1);
1084         }
1085     }
1086     printer_finish_job(term->print_job);
1087     term->print_job = NULL;
1088     term->printing = term->only_printing = FALSE;
1089 }
1090
1091 /*
1092  * Remove everything currently in `inbuf' and stick it up on the
1093  * in-memory display. There's a big state machine in here to
1094  * process escape sequences...
1095  */
1096 void term_out(Terminal *term)
1097 {
1098     int c, unget;
1099     unsigned char localbuf[256], *chars;
1100     int nchars = 0;
1101
1102     unget = -1;
1103
1104     chars = NULL;                      /* placate compiler warnings */
1105     while (nchars > 0 || bufchain_size(&term->inbuf) > 0) {
1106         if (unget == -1) {
1107             if (nchars == 0) {
1108                 void *ret;
1109                 bufchain_prefix(&term->inbuf, &ret, &nchars);
1110                 if (nchars > sizeof(localbuf))
1111                     nchars = sizeof(localbuf);
1112                 memcpy(localbuf, ret, nchars);
1113                 bufchain_consume(&term->inbuf, nchars);
1114                 chars = localbuf;
1115                 assert(chars != NULL);
1116             }
1117             c = *chars++;
1118             nchars--;
1119
1120             /*
1121              * Optionally log the session traffic to a file. Useful for
1122              * debugging and possibly also useful for actual logging.
1123              */
1124             if (term->cfg->logtype == LGTYP_DEBUG && term->logctx)
1125                 logtraffic(term->logctx, (unsigned char) c, LGTYP_DEBUG);
1126         } else {
1127             c = unget;
1128             unget = -1;
1129         }
1130
1131         /* Note only VT220+ are 8-bit VT102 is seven bit, it shouldn't even
1132          * be able to display 8-bit characters, but I'll let that go 'cause
1133          * of i18n.
1134          */
1135
1136         /*
1137          * If we're printing, add the character to the printer
1138          * buffer.
1139          */
1140         if (term->printing) {
1141             bufchain_add(&term->printer_buf, &c, 1);
1142
1143             /*
1144              * If we're in print-only mode, we use a much simpler
1145              * state machine designed only to recognise the ESC[4i
1146              * termination sequence.
1147              */
1148             if (term->only_printing) {
1149                 if (c == '\033')
1150                     term->print_state = 1;
1151                 else if (c == (unsigned char)'\233')
1152                     term->print_state = 2;
1153                 else if (c == '[' && term->print_state == 1)
1154                     term->print_state = 2;
1155                 else if (c == '4' && term->print_state == 2)
1156                     term->print_state = 3;
1157                 else if (c == 'i' && term->print_state == 3)
1158                     term->print_state = 4;
1159                 else
1160                     term->print_state = 0;
1161                 if (term->print_state == 4) {
1162                     term_print_finish(term);
1163                 }
1164                 continue;
1165             }
1166         }
1167
1168         /* First see about all those translations. */
1169         if (term->termstate == TOPLEVEL) {
1170             if (in_utf(term))
1171                 switch (term->utf_state) {
1172                   case 0:
1173                     if (c < 0x80) {
1174                         /* UTF-8 must be stateless so we ignore iso2022. */
1175                         if (unitab_ctrl[c] != 0xFF)
1176                              c = unitab_ctrl[c];
1177                         else c = ((unsigned char)c) | ATTR_ASCII;
1178                         break;
1179                     } else if ((c & 0xe0) == 0xc0) {
1180                         term->utf_size = term->utf_state = 1;
1181                         term->utf_char = (c & 0x1f);
1182                     } else if ((c & 0xf0) == 0xe0) {
1183                         term->utf_size = term->utf_state = 2;
1184                         term->utf_char = (c & 0x0f);
1185                     } else if ((c & 0xf8) == 0xf0) {
1186                         term->utf_size = term->utf_state = 3;
1187                         term->utf_char = (c & 0x07);
1188                     } else if ((c & 0xfc) == 0xf8) {
1189                         term->utf_size = term->utf_state = 4;
1190                         term->utf_char = (c & 0x03);
1191                     } else if ((c & 0xfe) == 0xfc) {
1192                         term->utf_size = term->utf_state = 5;
1193                         term->utf_char = (c & 0x01);
1194                     } else {
1195                         c = UCSERR;
1196                         break;
1197                     }
1198                     continue;
1199                   case 1:
1200                   case 2:
1201                   case 3:
1202                   case 4:
1203                   case 5:
1204                     if ((c & 0xC0) != 0x80) {
1205                         unget = c;
1206                         c = UCSERR;
1207                         term->utf_state = 0;
1208                         break;
1209                     }
1210                     term->utf_char = (term->utf_char << 6) | (c & 0x3f);
1211                     if (--term->utf_state)
1212                         continue;
1213
1214                     c = term->utf_char;
1215
1216                     /* Is somebody trying to be evil! */
1217                     if (c < 0x80 ||
1218                         (c < 0x800 && term->utf_size >= 2) ||
1219                         (c < 0x10000 && term->utf_size >= 3) ||
1220                         (c < 0x200000 && term->utf_size >= 4) ||
1221                         (c < 0x4000000 && term->utf_size >= 5))
1222                         c = UCSERR;
1223
1224                     /* Unicode line separator and paragraph separator are CR-LF */
1225                     if (c == 0x2028 || c == 0x2029)
1226                         c = 0x85;
1227
1228                     /* High controls are probably a Baaad idea too. */
1229                     if (c < 0xA0)
1230                         c = 0xFFFD;
1231
1232                     /* The UTF-16 surrogates are not nice either. */
1233                     /*       The standard give the option of decoding these:
1234                      *       I don't want to! */
1235                     if (c >= 0xD800 && c < 0xE000)
1236                         c = UCSERR;
1237
1238                     /* ISO 10646 characters now limited to UTF-16 range. */
1239                     if (c > 0x10FFFF)
1240                         c = UCSERR;
1241
1242                     /* This is currently a TagPhobic application.. */
1243                     if (c >= 0xE0000 && c <= 0xE007F)
1244                         continue;
1245
1246                     /* U+FEFF is best seen as a null. */
1247                     if (c == 0xFEFF)
1248                         continue;
1249                     /* But U+FFFE is an error. */
1250                     if (c == 0xFFFE || c == 0xFFFF)
1251                         c = UCSERR;
1252
1253                     /* Oops this is a 16bit implementation */
1254                     if (c >= 0x10000)
1255                         c = 0xFFFD;
1256                     break;
1257             }
1258             /* Are we in the nasty ACS mode? Note: no sco in utf mode. */
1259             else if(term->sco_acs &&
1260                     (c!='\033' && c!='\012' && c!='\015' && c!='\b'))
1261             {
1262                if (term->sco_acs == 2) c ^= 0x80;
1263                c |= ATTR_SCOACS;
1264             } else {
1265                 switch (term->cset_attr[term->cset]) {
1266                     /*
1267                      * Linedraw characters are different from 'ESC ( B'
1268                      * only for a small range. For ones outside that
1269                      * range, make sure we use the same font as well as
1270                      * the same encoding.
1271                      */
1272                   case ATTR_LINEDRW:
1273                     if (unitab_ctrl[c] != 0xFF)
1274                         c = unitab_ctrl[c];
1275                     else
1276                         c = ((unsigned char) c) | ATTR_LINEDRW;
1277                     break;
1278
1279                   case ATTR_GBCHR:
1280                     /* If UK-ASCII, make the '#' a LineDraw Pound */
1281                     if (c == '#') {
1282                         c = '}' | ATTR_LINEDRW;
1283                         break;
1284                     }
1285                   /*FALLTHROUGH*/ case ATTR_ASCII:
1286                     if (unitab_ctrl[c] != 0xFF)
1287                         c = unitab_ctrl[c];
1288                     else
1289                         c = ((unsigned char) c) | ATTR_ASCII;
1290                     break;
1291                 case ATTR_SCOACS:
1292                     if (c>=' ') c = ((unsigned char)c) | ATTR_SCOACS;
1293                     break;
1294                 }
1295             }
1296         }
1297
1298         /* How about C1 controls ? */
1299         if ((c & -32) == 0x80 && term->termstate < DO_CTRLS &&
1300             !term->vt52_mode && has_compat(VT220)) {
1301             term->termstate = SEEN_ESC;
1302             term->esc_query = FALSE;
1303             c = '@' + (c & 0x1F);
1304         }
1305
1306         /* Or the GL control. */
1307         if (c == '\177' && term->termstate < DO_CTRLS && has_compat(OTHER)) {
1308             if (term->curs.x && !term->wrapnext)
1309                 term->curs.x--;
1310             term->wrapnext = FALSE;
1311             fix_cpos;
1312             if (!term->cfg->no_dbackspace)    /* destructive bksp might be disabled */
1313                 *term->cpos = (' ' | term->curr_attr | ATTR_ASCII);
1314         } else
1315             /* Or normal C0 controls. */
1316         if ((c & -32) == 0 && term->termstate < DO_CTRLS) {
1317             switch (c) {
1318               case '\005':             /* terminal type query */
1319                 /* Strictly speaking this is VT100 but a VT100 defaults to
1320                  * no response. Other terminals respond at their option.
1321                  *
1322                  * Don't put a CR in the default string as this tends to
1323                  * upset some weird software.
1324                  *
1325                  * An xterm returns "xterm" (5 characters)
1326                  */
1327                 compatibility(ANSIMIN);
1328                 if (term->ldisc) {
1329                     char abuf[256], *s, *d;
1330                     int state = 0;
1331                     for (s = term->cfg->answerback, d = abuf; *s; s++) {
1332                         if (state) {
1333                             if (*s >= 'a' && *s <= 'z')
1334                                 *d++ = (*s - ('a' - 1));
1335                             else if ((*s >= '@' && *s <= '_') ||
1336                                      *s == '?' || (*s & 0x80))
1337                                 *d++ = ('@' ^ *s);
1338                             else if (*s == '~')
1339                                 *d++ = '^';
1340                             state = 0;
1341                         } else if (*s == '^') {
1342                             state = 1;
1343                         } else
1344                             *d++ = *s;
1345                     }
1346                     lpage_send(term->ldisc, DEFAULT_CODEPAGE,
1347                                abuf, d - abuf, 0);
1348                 }
1349                 break;
1350               case '\007':
1351                 {
1352                     struct beeptime *newbeep;
1353                     unsigned long ticks;
1354
1355                     ticks = GETTICKCOUNT();
1356
1357                     if (!term->beep_overloaded) {
1358                         newbeep = smalloc(sizeof(struct beeptime));
1359                         newbeep->ticks = ticks;
1360                         newbeep->next = NULL;
1361                         if (!term->beephead)
1362                             term->beephead = newbeep;
1363                         else
1364                             term->beeptail->next = newbeep;
1365                         term->beeptail = newbeep;
1366                         term->nbeeps++;
1367                     }
1368
1369                     /*
1370                      * Throw out any beeps that happened more than
1371                      * t seconds ago.
1372                      */
1373                     while (term->beephead &&
1374                            term->beephead->ticks < ticks - term->cfg->bellovl_t) {
1375                         struct beeptime *tmp = term->beephead;
1376                         term->beephead = tmp->next;
1377                         sfree(tmp);
1378                         if (!term->beephead)
1379                             term->beeptail = NULL;
1380                         term->nbeeps--;
1381                     }
1382
1383                     if (term->cfg->bellovl && term->beep_overloaded &&
1384                         ticks - term->lastbeep >= (unsigned)term->cfg->bellovl_s) {
1385                         /*
1386                          * If we're currently overloaded and the
1387                          * last beep was more than s seconds ago,
1388                          * leave overload mode.
1389                          */
1390                         term->beep_overloaded = FALSE;
1391                     } else if (term->cfg->bellovl && !term->beep_overloaded &&
1392                                term->nbeeps >= term->cfg->bellovl_n) {
1393                         /*
1394                          * Now, if we have n or more beeps
1395                          * remaining in the queue, go into overload
1396                          * mode.
1397                          */
1398                         term->beep_overloaded = TRUE;
1399                     }
1400                     term->lastbeep = ticks;
1401
1402                     /*
1403                      * Perform an actual beep if we're not overloaded.
1404                      */
1405                     if (!term->cfg->bellovl || !term->beep_overloaded) {
1406                         beep(term->frontend, term->cfg->beep);
1407                         if (term->cfg->beep == BELL_VISUAL) {
1408                             term->in_vbell = TRUE;
1409                             term->vbell_startpoint = ticks;
1410                             term_update(term);
1411                         }
1412                     }
1413                     term->disptop = 0;
1414                 }
1415                 break;
1416               case '\b':
1417                 if (term->curs.x == 0 &&
1418                     (term->curs.y == 0 || term->wrap == 0))
1419                     /* do nothing */ ;
1420                 else if (term->curs.x == 0 && term->curs.y > 0)
1421                     term->curs.x = term->cols - 1, term->curs.y--;
1422                 else if (term->wrapnext)
1423                     term->wrapnext = FALSE;
1424                 else
1425                     term->curs.x--;
1426                 fix_cpos;
1427                 term->seen_disp_event = TRUE;
1428                 break;
1429               case '\016':
1430                 compatibility(VT100);
1431                 term->cset = 1;
1432                 break;
1433               case '\017':
1434                 compatibility(VT100);
1435                 term->cset = 0;
1436                 break;
1437               case '\033':
1438                 if (term->vt52_mode)
1439                     term->termstate = VT52_ESC;
1440                 else {
1441                     compatibility(ANSIMIN);
1442                     term->termstate = SEEN_ESC;
1443                     term->esc_query = FALSE;
1444                 }
1445                 break;
1446               case '\015':
1447                 term->curs.x = 0;
1448                 term->wrapnext = FALSE;
1449                 fix_cpos;
1450                 term->seen_disp_event = TRUE;
1451                 term->paste_hold = 0;
1452                 if (term->logctx)
1453                     logtraffic(term->logctx, (unsigned char) c, LGTYP_ASCII);
1454                 break;
1455               case '\014':
1456                 if (has_compat(SCOANSI)) {
1457                     move(term, 0, 0, 0);
1458                     erase_lots(term, FALSE, FALSE, TRUE);
1459                     term->disptop = 0;
1460                     term->wrapnext = FALSE;
1461                     term->seen_disp_event = 1;
1462                     break;
1463                 }
1464               case '\013':
1465                 compatibility(VT100);
1466               case '\012':
1467                 if (term->curs.y == term->marg_b)
1468                     scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1469                 else if (term->curs.y < term->rows - 1)
1470                     term->curs.y++;
1471                 if (term->cfg->lfhascr)
1472                     term->curs.x = 0;
1473                 fix_cpos;
1474                 term->wrapnext = FALSE;
1475                 term->seen_disp_event = 1;
1476                 term->paste_hold = 0;
1477                 if (term->logctx)
1478                     logtraffic(term->logctx, (unsigned char) c, LGTYP_ASCII);
1479                 break;
1480               case '\t':
1481                 {
1482                     pos old_curs = term->curs;
1483                     unsigned long *ldata = lineptr(term->curs.y);
1484
1485                     do {
1486                         term->curs.x++;
1487                     } while (term->curs.x < term->cols - 1 &&
1488                              !term->tabs[term->curs.x]);
1489
1490                     if ((ldata[term->cols] & LATTR_MODE) != LATTR_NORM) {
1491                         if (term->curs.x >= term->cols / 2)
1492                             term->curs.x = term->cols / 2 - 1;
1493                     } else {
1494                         if (term->curs.x >= term->cols)
1495                             term->curs.x = term->cols - 1;
1496                     }
1497
1498                     fix_cpos;
1499                     check_selection(term, old_curs, term->curs);
1500                 }
1501                 term->seen_disp_event = TRUE;
1502                 break;
1503             }
1504         } else
1505             switch (term->termstate) {
1506               case TOPLEVEL:
1507                 /* Only graphic characters get this far;
1508                  * ctrls are stripped above */
1509                 if (term->wrapnext && term->wrap) {
1510                     term->cpos[1] |= LATTR_WRAPPED;
1511                     if (term->curs.y == term->marg_b)
1512                         scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1513                     else if (term->curs.y < term->rows - 1)
1514                         term->curs.y++;
1515                     term->curs.x = 0;
1516                     fix_cpos;
1517                     term->wrapnext = FALSE;
1518                 }
1519                 if (term->insert)
1520                     insch(term, 1);
1521                 if (term->selstate != NO_SELECTION) {
1522                     pos cursplus = term->curs;
1523                     incpos(cursplus);
1524                     check_selection(term, term->curs, cursplus);
1525                 }
1526                 if (((c & CSET_MASK) == ATTR_ASCII || (c & CSET_MASK) == 0) &&
1527                     term->logctx)
1528                     logtraffic(term->logctx, (unsigned char) c, LGTYP_ASCII);
1529                 {
1530                     extern int wcwidth(wchar_t ucs);
1531                     int width = 0;
1532                     if (DIRECT_CHAR(c))
1533                         width = 1;
1534                     if (!width)
1535                         width = wcwidth((wchar_t) c);
1536                     switch (width) {
1537                       case 2:
1538                         *term->cpos++ = c | term->curr_attr;
1539                         if (++term->curs.x == term->cols) {
1540                             *term->cpos |= LATTR_WRAPPED;
1541                             if (term->curs.y == term->marg_b)
1542                                 scroll(term, term->marg_t, term->marg_b,
1543                                        1, TRUE);
1544                             else if (term->curs.y < term->rows - 1)
1545                                 term->curs.y++;
1546                             term->curs.x = 0;
1547                             fix_cpos;
1548                         }
1549                         *term->cpos++ = UCSWIDE | term->curr_attr;
1550                         break;
1551                       case 1:
1552                         *term->cpos++ = c | term->curr_attr;
1553                         break;
1554                       default:
1555                         continue;
1556                     }
1557                 }
1558                 term->curs.x++;
1559                 if (term->curs.x == term->cols) {
1560                     term->cpos--;
1561                     term->curs.x--;
1562                     term->wrapnext = TRUE;
1563                     if (term->wrap && term->vt52_mode) {
1564                         term->cpos[1] |= LATTR_WRAPPED;
1565                         if (term->curs.y == term->marg_b)
1566                             scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1567                         else if (term->curs.y < term->rows - 1)
1568                             term->curs.y++;
1569                         term->curs.x = 0;
1570                         fix_cpos;
1571                         term->wrapnext = FALSE;
1572                     }
1573                 }
1574                 term->seen_disp_event = 1;
1575                 break;
1576
1577               case OSC_MAYBE_ST:
1578                 /*
1579                  * This state is virtually identical to SEEN_ESC, with the
1580                  * exception that we have an OSC sequence in the pipeline,
1581                  * and _if_ we see a backslash, we process it.
1582                  */
1583                 if (c == '\\') {
1584                     do_osc(term);
1585                     term->termstate = TOPLEVEL;
1586                     break;
1587                 }
1588                 /* else fall through */
1589               case SEEN_ESC:
1590                 if (c >= ' ' && c <= '/') {
1591                     if (term->esc_query)
1592                         term->esc_query = -1;
1593                     else
1594                         term->esc_query = c;
1595                     break;
1596                 }
1597                 term->termstate = TOPLEVEL;
1598                 switch (ANSI(c, term->esc_query)) {
1599                   case '[':            /* enter CSI mode */
1600                     term->termstate = SEEN_CSI;
1601                     term->esc_nargs = 1;
1602                     term->esc_args[0] = ARG_DEFAULT;
1603                     term->esc_query = FALSE;
1604                     break;
1605                   case ']':            /* xterm escape sequences */
1606                     /* Compatibility is nasty here, xterm, linux, decterm yuk! */
1607                     compatibility(OTHER);
1608                     term->termstate = SEEN_OSC;
1609                     term->esc_args[0] = 0;
1610                     break;
1611                   case '7':            /* save cursor */
1612                     compatibility(VT100);
1613                     save_cursor(term, TRUE);
1614                     break;
1615                   case '8':            /* restore cursor */
1616                     compatibility(VT100);
1617                     save_cursor(term, FALSE);
1618                     term->seen_disp_event = TRUE;
1619                     break;
1620                   case '=':
1621                     compatibility(VT100);
1622                     term->app_keypad_keys = TRUE;
1623                     break;
1624                   case '>':
1625                     compatibility(VT100);
1626                     term->app_keypad_keys = FALSE;
1627                     break;
1628                   case 'D':            /* exactly equivalent to LF */
1629                     compatibility(VT100);
1630                     if (term->curs.y == term->marg_b)
1631                         scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1632                     else if (term->curs.y < term->rows - 1)
1633                         term->curs.y++;
1634                     fix_cpos;
1635                     term->wrapnext = FALSE;
1636                     term->seen_disp_event = TRUE;
1637                     break;
1638                   case 'E':            /* exactly equivalent to CR-LF */
1639                     compatibility(VT100);
1640                     term->curs.x = 0;
1641                     if (term->curs.y == term->marg_b)
1642                         scroll(term, term->marg_t, term->marg_b, 1, TRUE);
1643                     else if (term->curs.y < term->rows - 1)
1644                         term->curs.y++;
1645                     fix_cpos;
1646                     term->wrapnext = FALSE;
1647                     term->seen_disp_event = TRUE;
1648                     break;
1649                   case 'M':            /* reverse index - backwards LF */
1650                     compatibility(VT100);
1651                     if (term->curs.y == term->marg_t)
1652                         scroll(term, term->marg_t, term->marg_b, -1, TRUE);
1653                     else if (term->curs.y > 0)
1654                         term->curs.y--;
1655                     fix_cpos;
1656                     term->wrapnext = FALSE;
1657                     term->seen_disp_event = TRUE;
1658                     break;
1659                   case 'Z':            /* terminal type query */
1660                     compatibility(VT100);
1661                     if (term->ldisc)
1662                         ldisc_send(term->ldisc, term->id_string,
1663                                    strlen(term->id_string), 0);
1664                     break;
1665                   case 'c':            /* restore power-on settings */
1666                     compatibility(VT100);
1667                     power_on(term);
1668                     if (term->ldisc)   /* cause ldisc to notice changes */
1669                         ldisc_send(term->ldisc, NULL, 0, 0);
1670                     if (term->reset_132) {
1671                         if (!term->cfg->no_remote_resize)
1672                             request_resize(term->frontend, 80, term->rows);
1673                         term->reset_132 = 0;
1674                     }
1675                     fix_cpos;
1676                     term->disptop = 0;
1677                     term->seen_disp_event = TRUE;
1678                     break;
1679                   case 'H':            /* set a tab */
1680                     compatibility(VT100);
1681                     term->tabs[term->curs.x] = TRUE;
1682                     break;
1683
1684                   case ANSI('8', '#'):  /* ESC # 8 fills screen with Es :-) */
1685                     compatibility(VT100);
1686                     {
1687                         unsigned long *ldata;
1688                         int i, j;
1689                         pos scrtop, scrbot;
1690
1691                         for (i = 0; i < term->rows; i++) {
1692                             ldata = lineptr(i);
1693                             for (j = 0; j < term->cols; j++)
1694                                 ldata[j] = ATTR_DEFAULT | 'E';
1695                             ldata[term->cols] = 0;
1696                         }
1697                         term->disptop = 0;
1698                         term->seen_disp_event = TRUE;
1699                         scrtop.x = scrtop.y = 0;
1700                         scrbot.x = 0;
1701                         scrbot.y = term->rows;
1702                         check_selection(term, scrtop, scrbot);
1703                     }
1704                     break;
1705
1706                   case ANSI('3', '#'):
1707                   case ANSI('4', '#'):
1708                   case ANSI('5', '#'):
1709                   case ANSI('6', '#'):
1710                     compatibility(VT100);
1711                     {
1712                         unsigned long nlattr;
1713                         unsigned long *ldata;
1714                         switch (ANSI(c, term->esc_query)) {
1715                           case ANSI('3', '#'):
1716                             nlattr = LATTR_TOP;
1717                             break;
1718                           case ANSI('4', '#'):
1719                             nlattr = LATTR_BOT;
1720                             break;
1721                           case ANSI('5', '#'):
1722                             nlattr = LATTR_NORM;
1723                             break;
1724                           default: /* spiritually case ANSI('6', '#'): */
1725                             nlattr = LATTR_WIDE;
1726                             break;
1727                         }
1728                         ldata = lineptr(term->curs.y);
1729                         ldata[term->cols] &= ~LATTR_MODE;
1730                         ldata[term->cols] |= nlattr;
1731                     }
1732                     break;
1733
1734                   case ANSI('A', '('):
1735                     compatibility(VT100);
1736                     if (!term->cfg->no_remote_charset)
1737                         term->cset_attr[0] = ATTR_GBCHR;
1738                     break;
1739                   case ANSI('B', '('):
1740                     compatibility(VT100);
1741                     if (!term->cfg->no_remote_charset)
1742                         term->cset_attr[0] = ATTR_ASCII;
1743                     break;
1744                   case ANSI('0', '('):
1745                     compatibility(VT100);
1746                     if (!term->cfg->no_remote_charset)
1747                         term->cset_attr[0] = ATTR_LINEDRW;
1748                     break;
1749                   case ANSI('U', '('):
1750                     compatibility(OTHER);
1751                     if (!term->cfg->no_remote_charset)
1752                         term->cset_attr[0] = ATTR_SCOACS;
1753                     break;
1754
1755                   case ANSI('A', ')'):
1756                     compatibility(VT100);
1757                     if (!term->cfg->no_remote_charset)
1758                         term->cset_attr[1] = ATTR_GBCHR;
1759                     break;
1760                   case ANSI('B', ')'):
1761                     compatibility(VT100);
1762                     if (!term->cfg->no_remote_charset)
1763                         term->cset_attr[1] = ATTR_ASCII;
1764                     break;
1765                   case ANSI('0', ')'):
1766                     compatibility(VT100);
1767                     if (!term->cfg->no_remote_charset)
1768                         term->cset_attr[1] = ATTR_LINEDRW;
1769                     break;
1770                   case ANSI('U', ')'):
1771                     compatibility(OTHER);
1772                     if (!term->cfg->no_remote_charset)
1773                         term->cset_attr[1] = ATTR_SCOACS;
1774                     break;
1775
1776                   case ANSI('8', '%'):  /* Old Linux code */
1777                   case ANSI('G', '%'):
1778                     compatibility(OTHER);
1779                     if (!term->cfg->no_remote_charset)
1780                         term->utf = 1;
1781                     break;
1782                   case ANSI('@', '%'):
1783                     compatibility(OTHER);
1784                     if (!term->cfg->no_remote_charset)
1785                         term->utf = 0;
1786                     break;
1787                 }
1788                 break;
1789               case SEEN_CSI:
1790                 term->termstate = TOPLEVEL;  /* default */
1791                 if (isdigit(c)) {
1792                     if (term->esc_nargs <= ARGS_MAX) {
1793                         if (term->esc_args[term->esc_nargs - 1] == ARG_DEFAULT)
1794                             term->esc_args[term->esc_nargs - 1] = 0;
1795                         term->esc_args[term->esc_nargs - 1] =
1796                             10 * term->esc_args[term->esc_nargs - 1] + c - '0';
1797                     }
1798                     term->termstate = SEEN_CSI;
1799                 } else if (c == ';') {
1800                     if (++term->esc_nargs <= ARGS_MAX)
1801                         term->esc_args[term->esc_nargs - 1] = ARG_DEFAULT;
1802                     term->termstate = SEEN_CSI;
1803                 } else if (c < '@') {
1804                     if (term->esc_query)
1805                         term->esc_query = -1;
1806                     else if (c == '?')
1807                         term->esc_query = TRUE;
1808                     else
1809                         term->esc_query = c;
1810                     term->termstate = SEEN_CSI;
1811                 } else
1812                     switch (ANSI(c, term->esc_query)) {
1813                       case 'A':       /* move up N lines */
1814                         move(term, term->curs.x,
1815                              term->curs.y - def(term->esc_args[0], 1), 1);
1816                         term->seen_disp_event = TRUE;
1817                         break;
1818                       case 'e':       /* move down N lines */
1819                         compatibility(ANSI);
1820                         /* FALLTHROUGH */
1821                       case 'B':
1822                         move(term, term->curs.x,
1823                              term->curs.y + def(term->esc_args[0], 1), 1);
1824                         term->seen_disp_event = TRUE;
1825                         break;
1826                       case ANSI('c', '>'):      /* report xterm version */
1827                         compatibility(OTHER);
1828                         /* this reports xterm version 136 so that VIM can
1829                            use the drag messages from the mouse reporting */
1830                         if (term->ldisc)
1831                             ldisc_send(term->ldisc, "\033[>0;136;0c", 11, 0);
1832                         break;
1833                       case 'a':       /* move right N cols */
1834                         compatibility(ANSI);
1835                         /* FALLTHROUGH */
1836                       case 'C':
1837                         move(term, term->curs.x + def(term->esc_args[0], 1),
1838                              term->curs.y, 1);
1839                         term->seen_disp_event = TRUE;
1840                         break;
1841                       case 'D':       /* move left N cols */
1842                         move(term, term->curs.x - def(term->esc_args[0], 1),
1843                              term->curs.y, 1);
1844                         term->seen_disp_event = TRUE;
1845                         break;
1846                       case 'E':       /* move down N lines and CR */
1847                         compatibility(ANSI);
1848                         move(term, 0,
1849                              term->curs.y + def(term->esc_args[0], 1), 1);
1850                         term->seen_disp_event = TRUE;
1851                         break;
1852                       case 'F':       /* move up N lines and CR */
1853                         compatibility(ANSI);
1854                         move(term, 0,
1855                              term->curs.y - def(term->esc_args[0], 1), 1);
1856                         term->seen_disp_event = TRUE;
1857                         break;
1858                       case 'G':
1859                       case '`':       /* set horizontal posn */
1860                         compatibility(ANSI);
1861                         move(term, def(term->esc_args[0], 1) - 1,
1862                              term->curs.y, 0);
1863                         term->seen_disp_event = TRUE;
1864                         break;
1865                       case 'd':       /* set vertical posn */
1866                         compatibility(ANSI);
1867                         move(term, term->curs.x,
1868                              ((term->dec_om ? term->marg_t : 0) +
1869                               def(term->esc_args[0], 1) - 1),
1870                              (term->dec_om ? 2 : 0));
1871                         term->seen_disp_event = TRUE;
1872                         break;
1873                       case 'H':
1874                       case 'f':       /* set horz and vert posns at once */
1875                         if (term->esc_nargs < 2)
1876                             term->esc_args[1] = ARG_DEFAULT;
1877                         move(term, def(term->esc_args[1], 1) - 1,
1878                              ((term->dec_om ? term->marg_t : 0) +
1879                               def(term->esc_args[0], 1) - 1),
1880                              (term->dec_om ? 2 : 0));
1881                         term->seen_disp_event = TRUE;
1882                         break;
1883                       case 'J':       /* erase screen or parts of it */
1884                         {
1885                             unsigned int i = def(term->esc_args[0], 0) + 1;
1886                             if (i > 3)
1887                                 i = 0;
1888                             erase_lots(term, FALSE, !!(i & 2), !!(i & 1));
1889                         }
1890                         term->disptop = 0;
1891                         term->seen_disp_event = TRUE;
1892                         break;
1893                       case 'K':       /* erase line or parts of it */
1894                         {
1895                             unsigned int i = def(term->esc_args[0], 0) + 1;
1896                             if (i > 3)
1897                                 i = 0;
1898                             erase_lots(term, TRUE, !!(i & 2), !!(i & 1));
1899                         }
1900                         term->seen_disp_event = TRUE;
1901                         break;
1902                       case 'L':       /* insert lines */
1903                         compatibility(VT102);
1904                         if (term->curs.y <= term->marg_b)
1905                             scroll(term, term->curs.y, term->marg_b,
1906                                    -def(term->esc_args[0], 1), FALSE);
1907                         fix_cpos;
1908                         term->seen_disp_event = TRUE;
1909                         break;
1910                       case 'M':       /* delete lines */
1911                         compatibility(VT102);
1912                         if (term->curs.y <= term->marg_b)
1913                             scroll(term, term->curs.y, term->marg_b,
1914                                    def(term->esc_args[0], 1),
1915                                    TRUE);
1916                         fix_cpos;
1917                         term->seen_disp_event = TRUE;
1918                         break;
1919                       case '@':       /* insert chars */
1920                         /* XXX VTTEST says this is vt220, vt510 manual says vt102 */
1921                         compatibility(VT102);
1922                         insch(term, def(term->esc_args[0], 1));
1923                         term->seen_disp_event = TRUE;
1924                         break;
1925                       case 'P':       /* delete chars */
1926                         compatibility(VT102);
1927                         insch(term, -def(term->esc_args[0], 1));
1928                         term->seen_disp_event = TRUE;
1929                         break;
1930                       case 'c':       /* terminal type query */
1931                         compatibility(VT100);
1932                         /* This is the response for a VT102 */
1933                         if (term->ldisc)
1934                             ldisc_send(term->ldisc, term->id_string,
1935                                        strlen(term->id_string), 0);
1936                         break;
1937                       case 'n':       /* cursor position query */
1938                         if (term->ldisc) {
1939                             if (term->esc_args[0] == 6) {
1940                                 char buf[32];
1941                                 sprintf(buf, "\033[%d;%dR", term->curs.y + 1,
1942                                         term->curs.x + 1);
1943                                 ldisc_send(term->ldisc, buf, strlen(buf), 0);
1944                             } else if (term->esc_args[0] == 5) {
1945                                 ldisc_send(term->ldisc, "\033[0n", 4, 0);
1946                             }
1947                         }
1948                         break;
1949                       case 'h':       /* toggle modes to high */
1950                       case ANSI_QUE('h'):
1951                         compatibility(VT100);
1952                         {
1953                             int i;
1954                             for (i = 0; i < term->esc_nargs; i++)
1955                                 toggle_mode(term, term->esc_args[i],
1956                                             term->esc_query, TRUE);
1957                         }
1958                         break;
1959                       case 'i':
1960                       case ANSI_QUE('i'):
1961                         compatibility(VT100);
1962                         {
1963                             if (term->esc_nargs != 1) break;
1964                             if (term->esc_args[0] == 5 && *term->cfg->printer) {
1965                                 term->printing = TRUE;
1966                                 term->only_printing = !term->esc_query;
1967                                 term->print_state = 0;
1968                                 term_print_setup(term);
1969                             } else if (term->esc_args[0] == 4 &&
1970                                        term->printing) {
1971                                 term_print_finish(term);
1972                             }
1973                         }
1974                         break;
1975                       case 'l':       /* toggle modes to low */
1976                       case ANSI_QUE('l'):
1977                         compatibility(VT100);
1978                         {
1979                             int i;
1980                             for (i = 0; i < term->esc_nargs; i++)
1981                                 toggle_mode(term, term->esc_args[i],
1982                                             term->esc_query, FALSE);
1983                         }
1984                         break;
1985                       case 'g':       /* clear tabs */
1986                         compatibility(VT100);
1987                         if (term->esc_nargs == 1) {
1988                             if (term->esc_args[0] == 0) {
1989                                 term->tabs[term->curs.x] = FALSE;
1990                             } else if (term->esc_args[0] == 3) {
1991                                 int i;
1992                                 for (i = 0; i < term->cols; i++)
1993                                     term->tabs[i] = FALSE;
1994                             }
1995                         }
1996                         break;
1997                       case 'r':       /* set scroll margins */
1998                         compatibility(VT100);
1999                         if (term->esc_nargs <= 2) {
2000                             int top, bot;
2001                             top = def(term->esc_args[0], 1) - 1;
2002                             bot = (term->esc_nargs <= 1
2003                                    || term->esc_args[1] == 0 ?
2004                                    term->rows :
2005                                    def(term->esc_args[1], term->rows)) - 1;
2006                             if (bot >= term->rows)
2007                                 bot = term->rows - 1;
2008                             /* VTTEST Bug 9 - if region is less than 2 lines
2009                              * don't change region.
2010                              */
2011                             if (bot - top > 0) {
2012                                 term->marg_t = top;
2013                                 term->marg_b = bot;
2014                                 term->curs.x = 0;
2015                                 /*
2016                                  * I used to think the cursor should be
2017                                  * placed at the top of the newly marginned
2018                                  * area. Apparently not: VMS TPU falls over
2019                                  * if so.
2020                                  *
2021                                  * Well actually it should for
2022                                  * Origin mode - RDB
2023                                  */
2024                                 term->curs.y = (term->dec_om ?
2025                                                 term->marg_t : 0);
2026                                 fix_cpos;
2027                                 term->seen_disp_event = TRUE;
2028                             }
2029                         }
2030                         break;
2031                       case 'm':       /* set graphics rendition */
2032                         {
2033                             /*
2034                              * A VT100 without the AVO only had one
2035                              * attribute, either underline or
2036                              * reverse video depending on the
2037                              * cursor type, this was selected by
2038                              * CSI 7m.
2039                              *
2040                              * case 2:
2041                              *  This is sometimes DIM, eg on the
2042                              *  GIGI and Linux
2043                              * case 8:
2044                              *  This is sometimes INVIS various ANSI.
2045                              * case 21:
2046                              *  This like 22 disables BOLD, DIM and INVIS
2047                              *
2048                              * The ANSI colours appear on any
2049                              * terminal that has colour (obviously)
2050                              * but the interaction between sgr0 and
2051                              * the colours varies but is usually
2052                              * related to the background colour
2053                              * erase item. The interaction between
2054                              * colour attributes and the mono ones
2055                              * is also very implementation
2056                              * dependent.
2057                              *
2058                              * The 39 and 49 attributes are likely
2059                              * to be unimplemented.
2060                              */
2061                             int i;
2062                             for (i = 0; i < term->esc_nargs; i++) {
2063                                 switch (def(term->esc_args[i], 0)) {
2064                                   case 0:       /* restore defaults */
2065                                     term->curr_attr = ATTR_DEFAULT;
2066                                     break;
2067                                   case 1:       /* enable bold */
2068                                     compatibility(VT100AVO);
2069                                     term->curr_attr |= ATTR_BOLD;
2070                                     break;
2071                                   case 21:      /* (enable double underline) */
2072                                     compatibility(OTHER);
2073                                   case 4:       /* enable underline */
2074                                     compatibility(VT100AVO);
2075                                     term->curr_attr |= ATTR_UNDER;
2076                                     break;
2077                                   case 5:       /* enable blink */
2078                                     compatibility(VT100AVO);
2079                                     term->curr_attr |= ATTR_BLINK;
2080                                     break;
2081                                   case 7:       /* enable reverse video */
2082                                     term->curr_attr |= ATTR_REVERSE;
2083                                     break;
2084                                   case 10:      /* SCO acs off */
2085                                     compatibility(SCOANSI);
2086                                     if (term->cfg->no_remote_charset) break;
2087                                     term->sco_acs = 0; break;
2088                                   case 11:      /* SCO acs on */
2089                                     compatibility(SCOANSI);
2090                                     if (term->cfg->no_remote_charset) break;
2091                                     term->sco_acs = 1; break;
2092                                   case 12:      /* SCO acs on flipped */
2093                                     compatibility(SCOANSI);
2094                                     if (term->cfg->no_remote_charset) break;
2095                                     term->sco_acs = 2; break;
2096                                   case 22:      /* disable bold */
2097                                     compatibility2(OTHER, VT220);
2098                                     term->curr_attr &= ~ATTR_BOLD;
2099                                     break;
2100                                   case 24:      /* disable underline */
2101                                     compatibility2(OTHER, VT220);
2102                                     term->curr_attr &= ~ATTR_UNDER;
2103                                     break;
2104                                   case 25:      /* disable blink */
2105                                     compatibility2(OTHER, VT220);
2106                                     term->curr_attr &= ~ATTR_BLINK;
2107                                     break;
2108                                   case 27:      /* disable reverse video */
2109                                     compatibility2(OTHER, VT220);
2110                                     term->curr_attr &= ~ATTR_REVERSE;
2111                                     break;
2112                                   case 30:
2113                                   case 31:
2114                                   case 32:
2115                                   case 33:
2116                                   case 34:
2117                                   case 35:
2118                                   case 36:
2119                                   case 37:
2120                                     /* foreground */
2121                                     term->curr_attr &= ~ATTR_FGMASK;
2122                                     term->curr_attr |=
2123                                         (term->esc_args[i] - 30)<<ATTR_FGSHIFT;
2124                                     break;
2125                                   case 39:      /* default-foreground */
2126                                     term->curr_attr &= ~ATTR_FGMASK;
2127                                     term->curr_attr |= ATTR_DEFFG;
2128                                     break;
2129                                   case 40:
2130                                   case 41:
2131                                   case 42:
2132                                   case 43:
2133                                   case 44:
2134                                   case 45:
2135                                   case 46:
2136                                   case 47:
2137                                     /* background */
2138                                     term->curr_attr &= ~ATTR_BGMASK;
2139                                     term->curr_attr |=
2140                                         (term->esc_args[i] - 40)<<ATTR_BGSHIFT;
2141                                     break;
2142                                   case 49:      /* default-background */
2143                                     term->curr_attr &= ~ATTR_BGMASK;
2144                                     term->curr_attr |= ATTR_DEFBG;
2145                                     break;
2146                                 }
2147                             }
2148                             if (term->use_bce)
2149                                 term->erase_char = (' ' | ATTR_ASCII |
2150                                                     (term->curr_attr &
2151                                                      (ATTR_FGMASK |
2152                                                       ATTR_BGMASK)));
2153                         }
2154                         break;
2155                       case 's':       /* save cursor */
2156                         save_cursor(term, TRUE);
2157                         break;
2158                       case 'u':       /* restore cursor */
2159                         save_cursor(term, FALSE);
2160                         term->seen_disp_event = TRUE;
2161                         break;
2162                       case 't':       /* set page size - ie window height */
2163                         /*
2164                          * VT340/VT420 sequence DECSLPP, DEC only allows values
2165                          *  24/25/36/48/72/144 other emulators (eg dtterm) use
2166                          * illegal values (eg first arg 1..9) for window changing
2167                          * and reports.
2168                          */
2169                         if (term->esc_nargs <= 1
2170                             && (term->esc_args[0] < 1 ||
2171                                 term->esc_args[0] >= 24)) {
2172                             compatibility(VT340TEXT);
2173                             if (!term->cfg->no_remote_resize)
2174                                 request_resize(term->frontend, term->cols,
2175                                                def(term->esc_args[0], 24));
2176                             deselect(term);
2177                         } else if (term->esc_nargs >= 1 &&
2178                                    term->esc_args[0] >= 1 &&
2179                                    term->esc_args[0] < 24) {
2180                             compatibility(OTHER);
2181
2182                             switch (term->esc_args[0]) {
2183                                 int x, y, len;
2184                                 char buf[80], *p;
2185                               case 1:
2186                                 set_iconic(term->frontend, FALSE);
2187                                 break;
2188                               case 2:
2189                                 set_iconic(term->frontend, TRUE);
2190                                 break;
2191                               case 3:
2192                                 if (term->esc_nargs >= 3) {
2193                                     if (!term->cfg->no_remote_resize)
2194                                         move_window(term->frontend,
2195                                                     def(term->esc_args[1], 0),
2196                                                     def(term->esc_args[2], 0));
2197                                 }
2198                                 break;
2199                               case 4:
2200                                 /* We should resize the window to a given
2201                                  * size in pixels here, but currently our
2202                                  * resizing code isn't healthy enough to
2203                                  * manage it. */
2204                                 break;
2205                               case 5:
2206                                 /* move to top */
2207                                 set_zorder(term->frontend, TRUE);
2208                                 break;
2209                               case 6:
2210                                 /* move to bottom */
2211                                 set_zorder(term->frontend, FALSE);
2212                                 break;
2213                               case 7:
2214                                 refresh_window(term->frontend);
2215                                 break;
2216                               case 8:
2217                                 if (term->esc_nargs >= 3) {
2218                                     if (!term->cfg->no_remote_resize)
2219                                         request_resize(term->frontend,
2220                                                        def(term->esc_args[2], term->cfg->width),
2221                                                        def(term->esc_args[1], term->cfg->height));
2222                                 }
2223                                 break;
2224                               case 9:
2225                                 if (term->esc_nargs >= 2)
2226                                     set_zoomed(term->frontend,
2227                                                term->esc_args[1] ?
2228                                                TRUE : FALSE);
2229                                 break;
2230                               case 11:
2231                                 if (term->ldisc)
2232                                     ldisc_send(term->ldisc,
2233                                                is_iconic(term->frontend) ?
2234                                                "\033[1t" : "\033[2t", 4, 0);
2235                                 break;
2236                               case 13:
2237                                 if (term->ldisc) {
2238                                     get_window_pos(term->frontend, &x, &y);
2239                                     len = sprintf(buf, "\033[3;%d;%dt", x, y);
2240                                     ldisc_send(term->ldisc, buf, len, 0);
2241                                 }
2242                                 break;
2243                               case 14:
2244                                 if (term->ldisc) {
2245                                     get_window_pixels(term->frontend, &x, &y);
2246                                     len = sprintf(buf, "\033[4;%d;%dt", x, y);
2247                                     ldisc_send(term->ldisc, buf, len, 0);
2248                                 }
2249                                 break;
2250                               case 18:
2251                                 if (term->ldisc) {
2252                                     len = sprintf(buf, "\033[8;%d;%dt",
2253                                                   term->rows, term->cols);
2254                                     ldisc_send(term->ldisc, buf, len, 0);
2255                                 }
2256                                 break;
2257                               case 19:
2258                                 /*
2259                                  * Hmmm. Strictly speaking we
2260                                  * should return `the size of the
2261                                  * screen in characters', but
2262                                  * that's not easy: (a) window
2263                                  * furniture being what it is it's
2264                                  * hard to compute, and (b) in
2265                                  * resize-font mode maximising the
2266                                  * window wouldn't change the
2267                                  * number of characters. *shrug*. I
2268                                  * think we'll ignore it for the
2269                                  * moment and see if anyone
2270                                  * complains, and then ask them
2271                                  * what they would like it to do.
2272                                  */
2273                                 break;
2274                               case 20:
2275                                 if (term->ldisc) {
2276                                     p = get_window_title(term->frontend, TRUE);
2277                                     len = strlen(p);
2278                                     ldisc_send(term->ldisc, "\033]L", 3, 0);
2279                                     ldisc_send(term->ldisc, p, len, 0);
2280                                     ldisc_send(term->ldisc, "\033\\", 2, 0);
2281                                 }
2282                                 break;
2283                               case 21:
2284                                 if (term->ldisc) {
2285                                     p = get_window_title(term->frontend,FALSE);
2286                                     len = strlen(p);
2287                                     ldisc_send(term->ldisc, "\033]l", 3, 0);
2288                                     ldisc_send(term->ldisc, p, len, 0);
2289                                     ldisc_send(term->ldisc, "\033\\", 2, 0);
2290                                 }
2291                                 break;
2292                             }
2293                         }
2294                         break;
2295                       case 'S':
2296                         compatibility(SCOANSI);
2297                         scroll(term, term->marg_t, term->marg_b,
2298                                def(term->esc_args[0], 1), TRUE);
2299                         fix_cpos;
2300                         term->wrapnext = FALSE;
2301                         term->seen_disp_event = TRUE;
2302                         break;
2303                       case 'T':
2304                         compatibility(SCOANSI);
2305                         scroll(term, term->marg_t, term->marg_b,
2306                                -def(term->esc_args[0], 1), TRUE);
2307                         fix_cpos;
2308                         term->wrapnext = FALSE;
2309                         term->seen_disp_event = TRUE;
2310                         break;
2311                       case ANSI('|', '*'):
2312                         /* VT420 sequence DECSNLS
2313                          * Set number of lines on screen
2314                          * VT420 uses VGA like hardware and can support any size in
2315                          * reasonable range (24..49 AIUI) with no default specified.
2316                          */
2317                         compatibility(VT420);
2318                         if (term->esc_nargs == 1 && term->esc_args[0] > 0) {
2319                             if (!term->cfg->no_remote_resize)
2320                                 request_resize(term->frontend, term->cols,
2321                                                def(term->esc_args[0],
2322                                                    term->cfg->height));
2323                             deselect(term);
2324                         }
2325                         break;
2326                       case ANSI('|', '$'):
2327                         /* VT340/VT420 sequence DECSCPP
2328                          * Set number of columns per page
2329                          * Docs imply range is only 80 or 132, but I'll allow any.
2330                          */
2331                         compatibility(VT340TEXT);
2332                         if (term->esc_nargs <= 1) {
2333                             if (!term->cfg->no_remote_resize)
2334                                 request_resize(term->frontend,
2335                                                def(term->esc_args[0],
2336                                                    term->cfg->width), term->rows);
2337                             deselect(term);
2338                         }
2339                         break;
2340                       case 'X':       /* write N spaces w/o moving cursor */
2341                         /* XXX VTTEST says this is vt220, vt510 manual says vt100 */
2342                         compatibility(ANSIMIN);
2343                         {
2344                             int n = def(term->esc_args[0], 1);
2345                             pos cursplus;
2346                             unsigned long *p = term->cpos;
2347                             if (n > term->cols - term->curs.x)
2348                                 n = term->cols - term->curs.x;
2349                             cursplus = term->curs;
2350                             cursplus.x += n;
2351                             check_selection(term, term->curs, cursplus);
2352                             while (n--)
2353                                 *p++ = term->erase_char;
2354                             term->seen_disp_event = TRUE;
2355                         }
2356                         break;
2357                       case 'x':       /* report terminal characteristics */
2358                         compatibility(VT100);
2359                         if (term->ldisc) {
2360                             char buf[32];
2361                             int i = def(term->esc_args[0], 0);
2362                             if (i == 0 || i == 1) {
2363                                 strcpy(buf, "\033[2;1;1;112;112;1;0x");
2364                                 buf[2] += i;
2365                                 ldisc_send(term->ldisc, buf, 20, 0);
2366                             }
2367                         }
2368                         break;
2369                       case 'Z':         /* BackTab for xterm */
2370                         compatibility(OTHER);
2371                         {
2372                             int i = def(term->esc_args[0], 1);
2373                             pos old_curs = term->curs;
2374
2375                             for(;i>0 && term->curs.x>0; i--) {
2376                                 do {
2377                                     term->curs.x--;
2378                                 } while (term->curs.x >0 &&
2379                                          !term->tabs[term->curs.x]);
2380                             }
2381                             fix_cpos;
2382                             check_selection(term, old_curs, term->curs);
2383                         }
2384                         break;
2385                       case ANSI('L', '='):
2386                         compatibility(OTHER);
2387                         term->use_bce = (term->esc_args[0] <= 0);
2388                         term->erase_char = ERASE_CHAR;
2389                         if (term->use_bce)
2390                             term->erase_char = (' ' | ATTR_ASCII |
2391                                                 (term->curr_attr &
2392                                                  (ATTR_FGMASK | ATTR_BGMASK)));
2393                         break;
2394                       case ANSI('E', '='):
2395                         compatibility(OTHER);
2396                         term->blink_is_real = (term->esc_args[0] >= 1);
2397                         break;
2398                       case ANSI('p', '"'):
2399                         /*
2400                          * Allow the host to make this emulator a
2401                          * 'perfect' VT102. This first appeared in
2402                          * the VT220, but we do need to get back to
2403                          * PuTTY mode so I won't check it.
2404                          *
2405                          * The arg in 40..42,50 are a PuTTY extension.
2406                          * The 2nd arg, 8bit vs 7bit is not checked.
2407                          *
2408                          * Setting VT102 mode should also change
2409                          * the Fkeys to generate PF* codes as a
2410                          * real VT102 has no Fkeys. The VT220 does
2411                          * this, F11..F13 become ESC,BS,LF other
2412                          * Fkeys send nothing.
2413                          *
2414                          * Note ESC c will NOT change this!
2415                          */
2416
2417                         switch (term->esc_args[0]) {
2418                           case 61:
2419                             term->compatibility_level &= ~TM_VTXXX;
2420                             term->compatibility_level |= TM_VT102;
2421                             break;
2422                           case 62:
2423                             term->compatibility_level &= ~TM_VTXXX;
2424                             term->compatibility_level |= TM_VT220;
2425                             break;
2426
2427                           default:
2428                             if (term->esc_args[0] > 60 &&
2429                                 term->esc_args[0] < 70)
2430                                 term->compatibility_level |= TM_VTXXX;
2431                             break;
2432
2433                           case 40:
2434                             term->compatibility_level &= TM_VTXXX;
2435                             break;
2436                           case 41:
2437                             term->compatibility_level = TM_PUTTY;
2438                             break;
2439                           case 42:
2440                             term->compatibility_level = TM_SCOANSI;
2441                             break;
2442
2443                           case ARG_DEFAULT:
2444                             term->compatibility_level = TM_PUTTY;
2445                             break;
2446                           case 50:
2447                             break;
2448                         }
2449
2450                         /* Change the response to CSI c */
2451                         if (term->esc_args[0] == 50) {
2452                             int i;
2453                             char lbuf[64];
2454                             strcpy(term->id_string, "\033[?");
2455                             for (i = 1; i < term->esc_nargs; i++) {
2456                                 if (i != 1)
2457                                     strcat(term->id_string, ";");
2458                                 sprintf(lbuf, "%d", term->esc_args[i]);
2459                                 strcat(term->id_string, lbuf);
2460                             }
2461                             strcat(term->id_string, "c");
2462                         }
2463 #if 0
2464                         /* Is this a good idea ?
2465                          * Well we should do a soft reset at this point ...
2466                          */
2467                         if (!has_compat(VT420) && has_compat(VT100)) {
2468                             if (!term->cfg->no_remote_resize) {
2469                                 if (term->reset_132)
2470                                     request_resize(132, 24);
2471                                 else
2472                                     request_resize(80, 24);
2473                             }
2474                         }
2475 #endif
2476                         break;
2477                     }
2478                 break;
2479               case SEEN_OSC:
2480                 term->osc_w = FALSE;
2481                 switch (c) {
2482                   case 'P':            /* Linux palette sequence */
2483                     term->termstate = SEEN_OSC_P;
2484                     term->osc_strlen = 0;
2485                     break;
2486                   case 'R':            /* Linux palette reset */
2487                     palette_reset(term->frontend);
2488                     term_invalidate(term);
2489                     term->termstate = TOPLEVEL;
2490                     break;
2491                   case 'W':            /* word-set */
2492                     term->termstate = SEEN_OSC_W;
2493                     term->osc_w = TRUE;
2494                     break;
2495                   case '0':
2496                   case '1':
2497                   case '2':
2498                   case '3':
2499                   case '4':
2500                   case '5':
2501                   case '6':
2502                   case '7':
2503                   case '8':
2504                   case '9':
2505                     term->esc_args[0] = 10 * term->esc_args[0] + c - '0';
2506                     break;
2507                   case 'L':
2508                     /*
2509                      * Grotty hack to support xterm and DECterm title
2510                      * sequences concurrently.
2511                      */
2512                     if (term->esc_args[0] == 2) {
2513                         term->esc_args[0] = 1;
2514                         break;
2515                     }
2516                     /* else fall through */
2517                   default:
2518                     term->termstate = OSC_STRING;
2519                     term->osc_strlen = 0;
2520                 }
2521                 break;
2522               case OSC_STRING:
2523                 /*
2524                  * This OSC stuff is EVIL. It takes just one character to get into
2525                  * sysline mode and it's not initially obvious how to get out.
2526                  * So I've added CR and LF as string aborts.
2527                  * This shouldn't effect compatibility as I believe embedded
2528                  * control characters are supposed to be interpreted (maybe?)
2529                  * and they don't display anything useful anyway.
2530                  *
2531                  * -- RDB
2532                  */
2533                 if (c == '\012' || c == '\015') {
2534                     term->termstate = TOPLEVEL;
2535                 } else if (c == 0234 || c == '\007') {
2536                     /*
2537                      * These characters terminate the string; ST and BEL
2538                      * terminate the sequence and trigger instant
2539                      * processing of it, whereas ESC goes back to SEEN_ESC
2540                      * mode unless it is followed by \, in which case it is
2541                      * synonymous with ST in the first place.
2542                      */
2543                     do_osc(term);
2544                     term->termstate = TOPLEVEL;
2545                 } else if (c == '\033')
2546                     term->termstate = OSC_MAYBE_ST;
2547                 else if (term->osc_strlen < OSC_STR_MAX)
2548                     term->osc_string[term->osc_strlen++] = c;
2549                 break;
2550               case SEEN_OSC_P:
2551                 {
2552                     int max = (term->osc_strlen == 0 ? 21 : 16);
2553                     int val;
2554                     if (c >= '0' && c <= '9')
2555                         val = c - '0';
2556                     else if (c >= 'A' && c <= 'A' + max - 10)
2557                         val = c - 'A' + 10;
2558                     else if (c >= 'a' && c <= 'a' + max - 10)
2559                         val = c - 'a' + 10;
2560                     else {
2561                         term->termstate = TOPLEVEL;
2562                         break;
2563                     }
2564                     term->osc_string[term->osc_strlen++] = val;
2565                     if (term->osc_strlen >= 7) {
2566                         palette_set(term->frontend, term->osc_string[0],
2567                                     term->osc_string[1] * 16 + term->osc_string[2],
2568                                     term->osc_string[3] * 16 + term->osc_string[4],
2569                                     term->osc_string[5] * 16 + term->osc_string[6]);
2570                         term_invalidate(term);
2571                         term->termstate = TOPLEVEL;
2572                     }
2573                 }
2574                 break;
2575               case SEEN_OSC_W:
2576                 switch (c) {
2577                   case '0':
2578                   case '1':
2579                   case '2':
2580                   case '3':
2581                   case '4':
2582                   case '5':
2583                   case '6':
2584                   case '7':
2585                   case '8':
2586                   case '9':
2587                     term->esc_args[0] = 10 * term->esc_args[0] + c - '0';
2588                     break;
2589                   default:
2590                     term->termstate = OSC_STRING;
2591                     term->osc_strlen = 0;
2592                 }
2593                 break;
2594               case VT52_ESC:
2595                 term->termstate = TOPLEVEL;
2596                 term->seen_disp_event = TRUE;
2597                 switch (c) {
2598                   case 'A':
2599                     move(term, term->curs.x, term->curs.y - 1, 1);
2600                     break;
2601                   case 'B':
2602                     move(term, term->curs.x, term->curs.y + 1, 1);
2603                     break;
2604                   case 'C':
2605                     move(term, term->curs.x + 1, term->curs.y, 1);
2606                     break;
2607                   case 'D':
2608                     move(term, term->curs.x - 1, term->curs.y, 1);
2609                     break;
2610                     /*
2611                      * From the VT100 Manual
2612                      * NOTE: The special graphics characters in the VT100
2613                      *       are different from those in the VT52
2614                      *
2615                      * From VT102 manual:
2616                      *       137 _  Blank             - Same
2617                      *       140 `  Reserved          - Humm.
2618                      *       141 a  Solid rectangle   - Similar
2619                      *       142 b  1/                - Top half of fraction for the
2620                      *       143 c  3/                - subscript numbers below.
2621                      *       144 d  5/
2622                      *       145 e  7/
2623                      *       146 f  Degrees           - Same
2624                      *       147 g  Plus or minus     - Same
2625                      *       150 h  Right arrow
2626                      *       151 i  Ellipsis (dots)
2627                      *       152 j  Divide by
2628                      *       153 k  Down arrow
2629                      *       154 l  Bar at scan 0
2630                      *       155 m  Bar at scan 1
2631                      *       156 n  Bar at scan 2
2632                      *       157 o  Bar at scan 3     - Similar
2633                      *       160 p  Bar at scan 4     - Similar
2634                      *       161 q  Bar at scan 5     - Similar
2635                      *       162 r  Bar at scan 6     - Same
2636                      *       163 s  Bar at scan 7     - Similar
2637                      *       164 t  Subscript 0
2638                      *       165 u  Subscript 1
2639                      *       166 v  Subscript 2
2640                      *       167 w  Subscript 3
2641                      *       170 x  Subscript 4
2642                      *       171 y  Subscript 5
2643                      *       172 z  Subscript 6
2644                      *       173 {  Subscript 7
2645                      *       174 |  Subscript 8
2646                      *       175 }  Subscript 9
2647                      *       176 ~  Paragraph
2648                      *
2649                      */
2650                   case 'F':
2651                     term->cset_attr[term->cset = 0] = ATTR_LINEDRW;
2652                     break;
2653                   case 'G':
2654                     term->cset_attr[term->cset = 0] = ATTR_ASCII;
2655                     break;
2656                   case 'H':
2657                     move(term, 0, 0, 0);
2658                     break;
2659                   case 'I':
2660                     if (term->curs.y == 0)
2661                         scroll(term, 0, term->rows - 1, -1, TRUE);
2662                     else if (term->curs.y > 0)
2663                         term->curs.y--;
2664                     fix_cpos;
2665                     term->wrapnext = FALSE;
2666                     break;
2667                   case 'J':
2668                     erase_lots(term, FALSE, FALSE, TRUE);
2669                     term->disptop = 0;
2670                     break;
2671                   case 'K':
2672                     erase_lots(term, TRUE, FALSE, TRUE);
2673                     break;
2674 #if 0
2675                   case 'V':
2676                     /* XXX Print cursor line */
2677                     break;
2678                   case 'W':
2679                     /* XXX Start controller mode */
2680                     break;
2681                   case 'X':
2682                     /* XXX Stop controller mode */
2683                     break;
2684 #endif
2685                   case 'Y':
2686                     term->termstate = VT52_Y1;
2687                     break;
2688                   case 'Z':
2689                     if (term->ldisc)
2690                         ldisc_send(term->ldisc, "\033/Z", 3, 0);
2691                     break;
2692                   case '=':
2693                     term->app_keypad_keys = TRUE;
2694                     break;
2695                   case '>':
2696                     term->app_keypad_keys = FALSE;
2697                     break;
2698                   case '<':
2699                     /* XXX This should switch to VT100 mode not current or default
2700                      *     VT mode. But this will only have effect in a VT220+
2701                      *     emulation.
2702                      */
2703                     term->vt52_mode = FALSE;
2704                     term->blink_is_real = term->cfg->blinktext;
2705                     break;
2706 #if 0
2707                   case '^':
2708                     /* XXX Enter auto print mode */
2709                     break;
2710                   case '_':
2711                     /* XXX Exit auto print mode */
2712                     break;
2713                   case ']':
2714                     /* XXX Print screen */
2715                     break;
2716 #endif
2717
2718 #ifdef VT52_PLUS
2719                   case 'E':
2720                     /* compatibility(ATARI) */
2721                     move(term, 0, 0, 0);
2722                     erase_lots(term, FALSE, FALSE, TRUE);
2723                     term->disptop = 0;
2724                     break;
2725                   case 'L':
2726                     /* compatibility(ATARI) */
2727                     if (term->curs.y <= term->marg_b)
2728                         scroll(term, term->curs.y, term->marg_b, -1, FALSE);
2729                     break;
2730                   case 'M':
2731                     /* compatibility(ATARI) */
2732                     if (term->curs.y <= term->marg_b)
2733                         scroll(term, term->curs.y, term->marg_b, 1, TRUE);
2734                     break;
2735                   case 'b':
2736                     /* compatibility(ATARI) */
2737                     term->termstate = VT52_FG;
2738                     break;
2739                   case 'c':
2740                     /* compatibility(ATARI) */
2741                     term->termstate = VT52_BG;
2742                     break;
2743                   case 'd':
2744                     /* compatibility(ATARI) */
2745                     erase_lots(term, FALSE, TRUE, FALSE);
2746                     term->disptop = 0;
2747                     break;
2748                   case 'e':
2749                     /* compatibility(ATARI) */
2750                     term->cursor_on = TRUE;
2751                     break;
2752                   case 'f':
2753                     /* compatibility(ATARI) */
2754                     term->cursor_on = FALSE;
2755                     break;
2756                     /* case 'j': Save cursor position - broken on ST */
2757                     /* case 'k': Restore cursor position */
2758                   case 'l':
2759                     /* compatibility(ATARI) */
2760                     erase_lots(term, TRUE, TRUE, TRUE);
2761                     term->curs.x = 0;
2762                     term->wrapnext = FALSE;
2763                     fix_cpos;
2764                     break;
2765                   case 'o':
2766                     /* compatibility(ATARI) */
2767                     erase_lots(term, TRUE, TRUE, FALSE);
2768                     break;
2769                   case 'p':
2770                     /* compatibility(ATARI) */
2771                     term->curr_attr |= ATTR_REVERSE;
2772                     break;
2773                   case 'q':
2774                     /* compatibility(ATARI) */
2775                     term->curr_attr &= ~ATTR_REVERSE;
2776                     break;
2777                   case 'v':            /* wrap Autowrap on - Wyse style */
2778                     /* compatibility(ATARI) */
2779                     term->wrap = 1;
2780                     break;
2781                   case 'w':            /* Autowrap off */
2782                     /* compatibility(ATARI) */
2783                     term->wrap = 0;
2784                     break;
2785
2786                   case 'R':
2787                     /* compatibility(OTHER) */
2788                     term->vt52_bold = FALSE;
2789                     term->curr_attr = ATTR_DEFAULT;
2790                     if (term->use_bce)
2791                         term->erase_char = (' ' | ATTR_ASCII |
2792                                             (term->curr_attr &
2793                                              (ATTR_FGMASK | ATTR_BGMASK)));
2794                     break;
2795                   case 'S':
2796                     /* compatibility(VI50) */
2797                     term->curr_attr |= ATTR_UNDER;
2798                     break;
2799                   case 'W':
2800                     /* compatibility(VI50) */
2801                     term->curr_attr &= ~ATTR_UNDER;
2802                     break;
2803                   case 'U':
2804                     /* compatibility(VI50) */
2805                     term->vt52_bold = TRUE;
2806                     term->curr_attr |= ATTR_BOLD;
2807                     break;
2808                   case 'T':
2809                     /* compatibility(VI50) */
2810                     term->vt52_bold = FALSE;
2811                     term->curr_attr &= ~ATTR_BOLD;
2812                     break;
2813 #endif
2814                 }
2815                 break;
2816               case VT52_Y1:
2817                 term->termstate = VT52_Y2;
2818                 move(term, term->curs.x, c - ' ', 0);
2819                 break;
2820               case VT52_Y2:
2821                 term->termstate = TOPLEVEL;
2822                 move(term, c - ' ', term->curs.y, 0);
2823                 break;
2824
2825 #ifdef VT52_PLUS
2826               case VT52_FG:
2827                 term->termstate = TOPLEVEL;
2828                 term->curr_attr &= ~ATTR_FGMASK;
2829                 term->curr_attr &= ~ATTR_BOLD;
2830                 term->curr_attr |= (c & 0x7) << ATTR_FGSHIFT;
2831                 if ((c & 0x8) || term->vt52_bold)
2832                     term->curr_attr |= ATTR_BOLD;
2833
2834                 if (term->use_bce)
2835                     term->erase_char = (' ' | ATTR_ASCII |
2836                                         (term->curr_attr &
2837                                          (ATTR_FGMASK | ATTR_BGMASK)));
2838                 break;
2839               case VT52_BG:
2840                 term->termstate = TOPLEVEL;
2841                 term->curr_attr &= ~ATTR_BGMASK;
2842                 term->curr_attr &= ~ATTR_BLINK;
2843                 term->curr_attr |= (c & 0x7) << ATTR_BGSHIFT;
2844
2845                 /* Note: bold background */
2846                 if (c & 0x8)
2847                     term->curr_attr |= ATTR_BLINK;
2848
2849                 if (term->use_bce)
2850                     term->erase_char = (' ' | ATTR_ASCII |
2851                                         (term->curr_attr &
2852                                          (ATTR_FGMASK | ATTR_BGMASK)));
2853                 break;
2854 #endif
2855               default: break;          /* placate gcc warning about enum use */
2856             }
2857         if (term->selstate != NO_SELECTION) {
2858             pos cursplus = term->curs;
2859             incpos(cursplus);
2860             check_selection(term, term->curs, cursplus);
2861         }
2862     }
2863
2864     term_print_flush(term);
2865 }
2866
2867 #if 0
2868 /*
2869  * Compare two lines to determine whether they are sufficiently
2870  * alike to scroll-optimise one to the other. Return the degree of
2871  * similarity.
2872  */
2873 static int linecmp(Terminal *term, unsigned long *a, unsigned long *b)
2874 {
2875     int i, n;
2876
2877     for (i = n = 0; i < term->cols; i++)
2878         n += (*a++ == *b++);
2879     return n;
2880 }
2881 #endif
2882
2883 /*
2884  * Given a context, update the window. Out of paranoia, we don't
2885  * allow WM_PAINT responses to do scrolling optimisations.
2886  */
2887 static void do_paint(Terminal *term, Context ctx, int may_optimise)
2888 {
2889     int i, j, our_curs_y;
2890     unsigned long rv, cursor;
2891     pos scrpos;
2892     char ch[1024];
2893     long cursor_background = ERASE_CHAR;
2894     unsigned long ticks;
2895
2896     /*
2897      * Check the visual bell state.
2898      */
2899     if (term->in_vbell) {
2900         ticks = GETTICKCOUNT();
2901         if (ticks - term->vbell_startpoint >= VBELL_TIMEOUT)
2902             term->in_vbell = FALSE;
2903    }
2904
2905     rv = (!term->rvideo ^ !term->in_vbell ? ATTR_REVERSE : 0);
2906
2907     /* Depends on:
2908      * screen array, disptop, scrtop,
2909      * selection, rv,
2910      * cfg.blinkpc, blink_is_real, tblinker,
2911      * curs.y, curs.x, blinker, cfg.blink_cur, cursor_on, has_focus, wrapnext
2912      */
2913
2914     /* Has the cursor position or type changed ? */
2915     if (term->cursor_on) {
2916         if (term->has_focus) {
2917             if (term->blinker || !term->cfg->blink_cur)
2918                 cursor = TATTR_ACTCURS;
2919             else
2920                 cursor = 0;
2921         } else
2922             cursor = TATTR_PASCURS;
2923         if (term->wrapnext)
2924             cursor |= TATTR_RIGHTCURS;
2925     } else
2926         cursor = 0;
2927     our_curs_y = term->curs.y - term->disptop;
2928
2929     if (term->dispcurs && (term->curstype != cursor ||
2930                            term->dispcurs !=
2931                            term->disptext + our_curs_y * (term->cols + 1) +
2932                            term->curs.x)) {
2933         if (term->dispcurs > term->disptext &&
2934                 (*term->dispcurs & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
2935             term->dispcurs[-1] |= ATTR_INVALID;
2936         if ( (term->dispcurs[1] & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
2937             term->dispcurs[1] |= ATTR_INVALID;
2938         *term->dispcurs |= ATTR_INVALID;
2939         term->curstype = 0;
2940     }
2941     term->dispcurs = NULL;
2942
2943     /* The normal screen data */
2944     for (i = 0; i < term->rows; i++) {
2945         unsigned long *ldata;
2946         int lattr;
2947         int idx, dirty_line, dirty_run, selected;
2948         unsigned long attr = 0;
2949         int updated_line = 0;
2950         int start = 0;
2951         int ccount = 0;
2952         int last_run_dirty = 0;
2953
2954         scrpos.y = i + term->disptop;
2955         ldata = lineptr(scrpos.y);
2956         lattr = (ldata[term->cols] & LATTR_MODE);
2957
2958         idx = i * (term->cols + 1);
2959         dirty_run = dirty_line = (ldata[term->cols] !=
2960                                   term->disptext[idx + term->cols]);
2961         term->disptext[idx + term->cols] = ldata[term->cols];
2962
2963         for (j = 0; j < term->cols; j++, idx++) {
2964             unsigned long tattr, tchar;
2965             unsigned long *d = ldata + j;
2966             int break_run;
2967             scrpos.x = j;
2968
2969             tchar = (*d & (CHAR_MASK | CSET_MASK));
2970             tattr = (*d & (ATTR_MASK ^ CSET_MASK));
2971             switch (tchar & CSET_MASK) {
2972               case ATTR_ASCII:
2973                 tchar = unitab_line[tchar & 0xFF];
2974                 break;
2975               case ATTR_LINEDRW:
2976                 tchar = unitab_xterm[tchar & 0xFF];
2977                 break;
2978               case ATTR_SCOACS:
2979                 tchar = unitab_scoacs[tchar&0xFF];
2980                 break;
2981             }
2982             tattr |= (tchar & CSET_MASK);
2983             tchar &= CHAR_MASK;
2984             if ((d[1] & (CHAR_MASK | CSET_MASK)) == UCSWIDE)
2985                     tattr |= ATTR_WIDE;
2986
2987             /* Video reversing things */
2988             if (term->selstate == DRAGGING || term->selstate == SELECTED) {
2989                 if (term->seltype == LEXICOGRAPHIC)
2990                     selected = (posle(term->selstart, scrpos) &&
2991                                 poslt(scrpos, term->selend));
2992                 else
2993                     selected = (posPle(term->selstart, scrpos) &&
2994                                 posPlt(scrpos, term->selend));
2995             } else
2996                 selected = FALSE;
2997             tattr = (tattr ^ rv
2998                      ^ (selected ? ATTR_REVERSE : 0));
2999
3000             /* 'Real' blinking ? */
3001             if (term->blink_is_real && (tattr & ATTR_BLINK)) {
3002                 if (term->has_focus && term->tblinker) {
3003                     tchar = ' ';
3004                     tattr &= ~CSET_MASK;
3005                     tattr |= ATTR_ACP;
3006                 }
3007                 tattr &= ~ATTR_BLINK;
3008             }
3009
3010             /*
3011              * Check the font we'll _probably_ be using to see if
3012              * the character is wide when we don't want it to be.
3013              */
3014             if ((tchar | tattr) != (term->disptext[idx]& ~ATTR_NARROW)) {
3015                 if ((tattr & ATTR_WIDE) == 0 &&
3016                     char_width(ctx, (tchar | tattr) & 0xFFFF) == 2)
3017                     tattr |= ATTR_NARROW;
3018             } else if (term->disptext[idx]&ATTR_NARROW)
3019                 tattr |= ATTR_NARROW;
3020
3021             /* Cursor here ? Save the 'background' */
3022             if (i == our_curs_y && j == term->curs.x) {
3023                 cursor_background = tattr | tchar;
3024                 term->dispcurs = term->disptext + idx;
3025             }
3026
3027             if ((term->disptext[idx] ^ tattr) & ATTR_WIDE)
3028                 dirty_line = TRUE;
3029
3030             break_run = (tattr != attr || j - start >= sizeof(ch));
3031
3032             /* Special hack for VT100 Linedraw glyphs */
3033             if ((attr & CSET_MASK) == 0x2300 && tchar >= 0xBA
3034                 && tchar <= 0xBD) break_run = TRUE;
3035
3036             if (!dbcs_screenfont && !dirty_line) {
3037                 if ((tchar | tattr) == term->disptext[idx])
3038                     break_run = TRUE;
3039                 else if (!dirty_run && ccount == 1)
3040                     break_run = TRUE;
3041             }
3042
3043             if (break_run) {
3044                 if ((dirty_run || last_run_dirty) && ccount > 0) {
3045                     do_text(ctx, start, i, ch, ccount, attr, lattr);
3046                     updated_line = 1;
3047                 }
3048                 start = j;
3049                 ccount = 0;
3050                 attr = tattr;
3051                 if (dbcs_screenfont)
3052                     last_run_dirty = dirty_run;
3053                 dirty_run = dirty_line;
3054             }
3055
3056             if ((tchar | tattr) != term->disptext[idx])
3057                 dirty_run = TRUE;
3058             ch[ccount++] = (char) tchar;
3059             term->disptext[idx] = tchar | tattr;
3060
3061             /* If it's a wide char step along to the next one. */
3062             if (tattr & ATTR_WIDE) {
3063                 if (++j < term->cols) {
3064                     idx++;
3065                     d++;
3066                     /* Cursor is here ? Ouch! */
3067                     if (i == our_curs_y && j == term->curs.x) {
3068                         cursor_background = *d;
3069                         term->dispcurs = term->disptext + idx;
3070                     }
3071                     if (term->disptext[idx] != *d)
3072                         dirty_run = TRUE;
3073                     term->disptext[idx] = *d;
3074                 }
3075             }
3076         }
3077         if (dirty_run && ccount > 0) {
3078             do_text(ctx, start, i, ch, ccount, attr, lattr);
3079             updated_line = 1;
3080         }
3081
3082         /* Cursor on this line ? (and changed) */
3083         if (i == our_curs_y && (term->curstype != cursor || updated_line)) {
3084             ch[0] = (char) (cursor_background & CHAR_MASK);
3085             attr = (cursor_background & ATTR_MASK) | cursor;
3086             do_cursor(ctx, term->curs.x, i, ch, 1, attr, lattr);
3087             term->curstype = cursor;
3088         }
3089     }
3090 }
3091
3092 /*
3093  * Flick the switch that says if blinking things should be shown or hidden.
3094  */
3095
3096 void term_blink(Terminal *term, int flg)
3097 {
3098     long now, blink_diff;
3099
3100     now = GETTICKCOUNT();
3101     blink_diff = now - term->last_tblink;
3102
3103     /* Make sure the text blinks no more than 2Hz; we'll use 0.45 s period. */
3104     if (blink_diff < 0 || blink_diff > (TICKSPERSEC * 9 / 20)) {
3105         term->last_tblink = now;
3106         term->tblinker = !term->tblinker;
3107     }
3108
3109     if (flg) {
3110         term->blinker = 1;
3111         term->last_blink = now;
3112         return;
3113     }
3114
3115     blink_diff = now - term->last_blink;
3116
3117     /* Make sure the cursor blinks no faster than system blink rate */
3118     if (blink_diff >= 0 && blink_diff < (long) CURSORBLINK)
3119         return;
3120
3121     term->last_blink = now;
3122     term->blinker = !term->blinker;
3123 }
3124
3125 /*
3126  * Invalidate the whole screen so it will be repainted in full.
3127  */
3128 void term_invalidate(Terminal *term)
3129 {
3130     int i;
3131
3132     for (i = 0; i < term->rows * (term->cols + 1); i++)
3133         term->disptext[i] = ATTR_INVALID;
3134 }
3135
3136 /*
3137  * Paint the window in response to a WM_PAINT message.
3138  */
3139 void term_paint(Terminal *term, Context ctx,
3140                 int left, int top, int right, int bottom, int immediately)
3141 {
3142     int i, j;
3143     if (left < 0) left = 0;
3144     if (top < 0) top = 0;
3145     if (right >= term->cols) right = term->cols-1;
3146     if (bottom >= term->rows) bottom = term->rows-1;
3147
3148     for (i = top; i <= bottom && i < term->rows; i++) {
3149         if ((term->disptext[i * (term->cols + 1) + term->cols] &
3150              LATTR_MODE) == LATTR_NORM)
3151             for (j = left; j <= right && j < term->cols; j++)
3152                 term->disptext[i * (term->cols + 1) + j] = ATTR_INVALID;
3153         else
3154             for (j = left / 2; j <= right / 2 + 1 && j < term->cols; j++)
3155                 term->disptext[i * (term->cols + 1) + j] = ATTR_INVALID;
3156     }
3157
3158     /* This should happen soon enough, also for some reason it sometimes
3159      * fails to actually do anything when re-sizing ... painting the wrong
3160      * window perhaps ?
3161      */
3162     if (immediately)
3163         do_paint (term, ctx, FALSE);
3164 }
3165
3166 /*
3167  * Attempt to scroll the scrollback. The second parameter gives the
3168  * position we want to scroll to; the first is +1 to denote that
3169  * this position is relative to the beginning of the scrollback, -1
3170  * to denote it is relative to the end, and 0 to denote that it is
3171  * relative to the current position.
3172  */
3173 void term_scroll(Terminal *term, int rel, int where)
3174 {
3175     int sbtop = -count234(term->scrollback);
3176 #ifdef OPTIMISE_SCROLL
3177     int olddisptop = term->disptop;
3178     int shift;
3179 #endif /* OPTIMISE_SCROLL */
3180
3181     term->disptop = (rel < 0 ? 0 : rel > 0 ? sbtop : term->disptop) + where;
3182     if (term->disptop < sbtop)
3183         term->disptop = sbtop;
3184     if (term->disptop > 0)
3185         term->disptop = 0;
3186     update_sbar(term);
3187 #ifdef OPTIMISE_SCROLL
3188     shift = (term->disptop - olddisptop);
3189     if (shift < term->rows && shift > -term->rows)
3190         scroll_display(term, 0, term->rows - 1, shift);
3191 #endif /* OPTIMISE_SCROLL */
3192     term_update(term);
3193 }
3194
3195 static void clipme(Terminal *term, pos top, pos bottom, int rect)
3196 {
3197     wchar_t *workbuf;
3198     wchar_t *wbptr;                    /* where next char goes within workbuf */
3199     int old_top_x;
3200     int wblen = 0;                     /* workbuf len */
3201     int buflen;                        /* amount of memory allocated to workbuf */
3202
3203     buflen = 5120;                     /* Default size */
3204     workbuf = smalloc(buflen * sizeof(wchar_t));
3205     wbptr = workbuf;                   /* start filling here */
3206     old_top_x = top.x;                 /* needed for rect==1 */
3207
3208     while (poslt(top, bottom)) {
3209         int nl = FALSE;
3210         unsigned long *ldata = lineptr(top.y);
3211         pos nlpos;
3212
3213         /*
3214          * nlpos will point at the maximum position on this line we
3215          * should copy up to. So we start it at the end of the
3216          * line...
3217          */
3218         nlpos.y = top.y;
3219         nlpos.x = term->cols;
3220
3221         /*
3222          * ... move it backwards if there's unused space at the end
3223          * of the line (and also set `nl' if this is the case,
3224          * because in normal selection mode this means we need a
3225          * newline at the end)...
3226          */
3227         if (!(ldata[term->cols] & LATTR_WRAPPED)) {
3228             while (((ldata[nlpos.x - 1] & 0xFF) == 0x20 ||
3229                     (DIRECT_CHAR(ldata[nlpos.x - 1]) &&
3230                      (ldata[nlpos.x - 1] & CHAR_MASK) == 0x20))
3231                    && poslt(top, nlpos))
3232                 decpos(nlpos);
3233             if (poslt(nlpos, bottom))
3234                 nl = TRUE;
3235         }
3236
3237         /*
3238          * ... and then clip it to the terminal x coordinate if
3239          * we're doing rectangular selection. (In this case we
3240          * still did the above, so that copying e.g. the right-hand
3241          * column from a table doesn't fill with spaces on the
3242          * right.)
3243          */
3244         if (rect) {
3245             if (nlpos.x > bottom.x)
3246                 nlpos.x = bottom.x;
3247             nl = (top.y < bottom.y);
3248         }
3249
3250         while (poslt(top, bottom) && poslt(top, nlpos)) {
3251 #if 0
3252             char cbuf[16], *p;
3253             sprintf(cbuf, "<U+%04x>", (ldata[top.x] & 0xFFFF));
3254 #else
3255             wchar_t cbuf[16], *p;
3256             int uc = (ldata[top.x] & 0xFFFF);
3257             int set, c;
3258
3259             if (uc == UCSWIDE) {
3260                 top.x++;
3261                 continue;
3262             }
3263
3264             switch (uc & CSET_MASK) {
3265               case ATTR_LINEDRW:
3266                 if (!term->cfg->rawcnp) {
3267                     uc = unitab_xterm[uc & 0xFF];
3268                     break;
3269                 }
3270               case ATTR_ASCII:
3271                 uc = unitab_line[uc & 0xFF];
3272                 break;
3273               case ATTR_SCOACS:
3274                 uc = unitab_scoacs[uc&0xFF];
3275                 break;
3276             }
3277             switch (uc & CSET_MASK) {
3278               case ATTR_ACP:
3279                 uc = unitab_font[uc & 0xFF];
3280                 break;
3281               case ATTR_OEMCP:
3282                 uc = unitab_oemcp[uc & 0xFF];
3283                 break;
3284             }
3285
3286             set = (uc & CSET_MASK);
3287             c = (uc & CHAR_MASK);
3288             cbuf[0] = uc;
3289             cbuf[1] = 0;
3290
3291             if (DIRECT_FONT(uc)) {
3292                 if (c >= ' ' && c != 0x7F) {
3293                     char buf[4];
3294                     WCHAR wbuf[4];
3295                     int rv;
3296                     if (is_dbcs_leadbyte(font_codepage, (BYTE) c)) {
3297                         buf[0] = c;
3298                         buf[1] = ldata[top.x + 1];
3299                         rv = mb_to_wc(font_codepage, 0, buf, 2, wbuf, 4);
3300                         top.x++;
3301                     } else {
3302                         buf[0] = c;
3303                         rv = mb_to_wc(font_codepage, 0, buf, 1, wbuf, 4);
3304                     }
3305
3306                     if (rv > 0) {
3307                         memcpy(cbuf, wbuf, rv * sizeof(wchar_t));
3308                         cbuf[rv] = 0;
3309                     }
3310                 }
3311             }
3312 #endif
3313
3314             for (p = cbuf; *p; p++) {
3315                 /* Enough overhead for trailing NL and nul */
3316                 if (wblen >= buflen - 16) {
3317                     workbuf =
3318                         srealloc(workbuf,
3319                                  sizeof(wchar_t) * (buflen += 100));
3320                     wbptr = workbuf + wblen;
3321                 }
3322                 wblen++;
3323                 *wbptr++ = *p;
3324             }
3325             top.x++;
3326         }
3327         if (nl) {
3328             int i;
3329             for (i = 0; i < sel_nl_sz; i++) {
3330                 wblen++;
3331                 *wbptr++ = sel_nl[i];
3332             }
3333         }
3334         top.y++;
3335         top.x = rect ? old_top_x : 0;
3336     }
3337 #if SELECTION_NUL_TERMINATED
3338     wblen++;
3339     *wbptr++ = 0;
3340 #endif
3341     write_clip(term->frontend, workbuf, wblen, FALSE); /* transfer to clipbd */
3342     if (buflen > 0)                    /* indicates we allocated this buffer */
3343         sfree(workbuf);
3344 }
3345
3346 void term_copyall(Terminal *term)
3347 {
3348     pos top;
3349     top.y = -count234(term->scrollback);
3350     top.x = 0;
3351     clipme(term, top, term->curs, 0);
3352 }
3353
3354 /*
3355  * The wordness array is mainly for deciding the disposition of the
3356  * US-ASCII characters.
3357  */
3358 static int wordtype(Terminal *term, int uc)
3359 {
3360     struct ucsword {
3361         int start, end, ctype;
3362     };
3363     static const struct ucsword ucs_words[] = {
3364         {
3365         128, 160, 0}, {
3366         161, 191, 1}, {
3367         215, 215, 1}, {
3368         247, 247, 1}, {
3369         0x037e, 0x037e, 1},            /* Greek question mark */
3370         {
3371         0x0387, 0x0387, 1},            /* Greek ano teleia */
3372         {
3373         0x055a, 0x055f, 1},            /* Armenian punctuation */
3374         {
3375         0x0589, 0x0589, 1},            /* Armenian full stop */
3376         {
3377         0x0700, 0x070d, 1},            /* Syriac punctuation */
3378         {
3379         0x104a, 0x104f, 1},            /* Myanmar punctuation */
3380         {
3381         0x10fb, 0x10fb, 1},            /* Georgian punctuation */
3382         {
3383         0x1361, 0x1368, 1},            /* Ethiopic punctuation */
3384         {
3385         0x166d, 0x166e, 1},            /* Canadian Syl. punctuation */
3386         {
3387         0x17d4, 0x17dc, 1},            /* Khmer punctuation */
3388         {
3389         0x1800, 0x180a, 1},            /* Mongolian punctuation */
3390         {
3391         0x2000, 0x200a, 0},            /* Various spaces */
3392         {
3393         0x2070, 0x207f, 2},            /* superscript */
3394         {
3395         0x2080, 0x208f, 2},            /* subscript */
3396         {
3397         0x200b, 0x27ff, 1},            /* punctuation and symbols */
3398         {
3399         0x3000, 0x3000, 0},            /* ideographic space */
3400         {
3401         0x3001, 0x3020, 1},            /* ideographic punctuation */
3402         {
3403         0x303f, 0x309f, 3},            /* Hiragana */
3404         {
3405         0x30a0, 0x30ff, 3},            /* Katakana */
3406         {
3407         0x3300, 0x9fff, 3},            /* CJK Ideographs */
3408         {
3409         0xac00, 0xd7a3, 3},            /* Hangul Syllables */
3410         {
3411         0xf900, 0xfaff, 3},            /* CJK Ideographs */
3412         {
3413         0xfe30, 0xfe6b, 1},            /* punctuation forms */
3414         {
3415         0xff00, 0xff0f, 1},            /* half/fullwidth ASCII */
3416         {
3417         0xff1a, 0xff20, 1},            /* half/fullwidth ASCII */
3418         {
3419         0xff3b, 0xff40, 1},            /* half/fullwidth ASCII */
3420         {
3421         0xff5b, 0xff64, 1},            /* half/fullwidth ASCII */
3422         {
3423         0xfff0, 0xffff, 0},            /* half/fullwidth ASCII */
3424         {
3425         0, 0, 0}
3426     };
3427     const struct ucsword *wptr;
3428
3429     uc &= (CSET_MASK | CHAR_MASK);
3430
3431     switch (uc & CSET_MASK) {
3432       case ATTR_LINEDRW:
3433         uc = unitab_xterm[uc & 0xFF];
3434         break;
3435       case ATTR_ASCII:
3436         uc = unitab_line[uc & 0xFF];
3437         break;
3438       case ATTR_SCOACS:
3439         uc = unitab_scoacs[uc&0xFF];
3440         break;
3441     }
3442     switch (uc & CSET_MASK) {
3443       case ATTR_ACP:
3444         uc = unitab_font[uc & 0xFF];
3445         break;
3446       case ATTR_OEMCP:
3447         uc = unitab_oemcp[uc & 0xFF];
3448         break;
3449     }
3450
3451     /* For DBCS font's I can't do anything usefull. Even this will sometimes
3452      * fail as there's such a thing as a double width space. :-(
3453      */
3454     if (dbcs_screenfont && font_codepage == line_codepage)
3455         return (uc != ' ');
3456
3457     if (uc < 0x80)
3458         return term->wordness[uc];
3459
3460     for (wptr = ucs_words; wptr->start; wptr++) {
3461         if (uc >= wptr->start && uc <= wptr->end)
3462             return wptr->ctype;
3463     }
3464
3465     return 2;
3466 }
3467
3468 /*
3469  * Spread the selection outwards according to the selection mode.
3470  */
3471 static pos sel_spread_half(Terminal *term, pos p, int dir)
3472 {
3473     unsigned long *ldata;
3474     short wvalue;
3475     int topy = -count234(term->scrollback);
3476
3477     ldata = lineptr(p.y);
3478
3479     switch (term->selmode) {
3480       case SM_CHAR:
3481         /*
3482          * In this mode, every character is a separate unit, except
3483          * for runs of spaces at the end of a non-wrapping line.
3484          */
3485         if (!(ldata[term->cols] & LATTR_WRAPPED)) {
3486             unsigned long *q = ldata + term->cols;
3487             while (q > ldata && (q[-1] & CHAR_MASK) == 0x20)
3488                 q--;
3489             if (q == ldata + term->cols)
3490                 q--;
3491             if (p.x >= q - ldata)
3492                 p.x = (dir == -1 ? q - ldata : term->cols - 1);
3493         }
3494         break;
3495       case SM_WORD:
3496         /*
3497          * In this mode, the units are maximal runs of characters
3498          * whose `wordness' has the same value.
3499          */
3500         wvalue = wordtype(term, ldata[p.x]);
3501         if (dir == +1) {
3502             while (1) {
3503                 if (p.x < term->cols-1) {
3504                     if (wordtype(term, ldata[p.x + 1]) == wvalue)
3505                         p.x++;
3506                     else
3507                         break;
3508                 } else {
3509                     if (ldata[term->cols] & LATTR_WRAPPED) {
3510                         unsigned long *ldata2;
3511                         ldata2 = lineptr(p.y+1);
3512                         if (wordtype(term, ldata2[0]) == wvalue) {
3513                             p.x = 0;
3514                             p.y++;
3515                             ldata = ldata2;
3516                         } else
3517                             break;
3518                     } else
3519                         break;
3520                 }
3521             }
3522         } else {
3523             while (1) {
3524                 if (p.x > 0) {
3525                     if (wordtype(term, ldata[p.x - 1]) == wvalue)
3526                         p.x--;
3527                     else
3528                         break;
3529                 } else {
3530                     unsigned long *ldata2;
3531                     if (p.y <= topy)
3532                         break;
3533                     ldata2 = lineptr(p.y-1);
3534                     if ((ldata2[term->cols] & LATTR_WRAPPED) &&
3535                         wordtype(term, ldata2[term->cols-1]) == wvalue) {
3536                         p.x = term->cols-1;
3537                         p.y--;
3538                         ldata = ldata2;
3539                     } else
3540                         break;
3541                 }
3542             }
3543         }
3544         break;
3545       case SM_LINE:
3546         /*
3547          * In this mode, every line is a unit.
3548          */
3549         p.x = (dir == -1 ? 0 : term->cols - 1);
3550         break;
3551     }
3552     return p;
3553 }
3554
3555 static void sel_spread(Terminal *term)
3556 {
3557     if (term->seltype == LEXICOGRAPHIC) {
3558         term->selstart = sel_spread_half(term, term->selstart, -1);
3559         decpos(term->selend);
3560         term->selend = sel_spread_half(term, term->selend, +1);
3561         incpos(term->selend);
3562     }
3563 }
3564
3565 void term_do_paste(Terminal *term)
3566 {
3567     wchar_t *data;
3568     int len;
3569
3570     get_clip(term->frontend, &data, &len);
3571     if (data && len > 0) {
3572         wchar_t *p, *q;
3573
3574         term_seen_key_event(term);     /* pasted data counts */
3575
3576         if (term->paste_buffer)
3577             sfree(term->paste_buffer);
3578         term->paste_pos = term->paste_hold = term->paste_len = 0;
3579         term->paste_buffer = smalloc(len * sizeof(wchar_t));
3580
3581         p = q = data;
3582         while (p < data + len) {
3583             while (p < data + len &&
3584                    !(p <= data + len - sel_nl_sz &&
3585                      !memcmp(p, sel_nl, sizeof(sel_nl))))
3586                 p++;
3587
3588             {
3589                 int i;
3590                 for (i = 0; i < p - q; i++) {
3591                     term->paste_buffer[term->paste_len++] = q[i];
3592                 }
3593             }
3594
3595             if (p <= data + len - sel_nl_sz &&
3596                 !memcmp(p, sel_nl, sizeof(sel_nl))) {
3597                 term->paste_buffer[term->paste_len++] = '\015';
3598                 p += sel_nl_sz;
3599             }
3600             q = p;
3601         }
3602
3603         /* Assume a small paste will be OK in one go. */
3604         if (term->paste_len < 256) {
3605             if (term->ldisc)
3606                 luni_send(term->ldisc, term->paste_buffer, term->paste_len, 0);
3607             if (term->paste_buffer)
3608                 sfree(term->paste_buffer);
3609             term->paste_buffer = 0;
3610             term->paste_pos = term->paste_hold = term->paste_len = 0;
3611         }
3612     }
3613     get_clip(term->frontend, NULL, NULL);
3614 }
3615
3616 void term_mouse(Terminal *term, Mouse_Button b, Mouse_Action a, int x, int y,
3617                 int shift, int ctrl, int alt)
3618 {
3619     pos selpoint;
3620     unsigned long *ldata;
3621     int raw_mouse = (term->xterm_mouse &&
3622                      !term->cfg->no_mouse_rep &&
3623                      !(term->cfg->mouse_override && shift));
3624     int default_seltype;
3625
3626     if (y < 0) {
3627         y = 0;
3628         if (a == MA_DRAG && !raw_mouse)
3629             term_scroll(term, 0, -1);
3630     }
3631     if (y >= term->rows) {
3632         y = term->rows - 1;
3633         if (a == MA_DRAG && !raw_mouse)
3634             term_scroll(term, 0, +1);
3635     }
3636     if (x < 0) {
3637         if (y > 0) {
3638             x = term->cols - 1;
3639             y--;
3640         } else
3641             x = 0;
3642     }
3643     if (x >= term->cols)
3644         x = term->cols - 1;
3645
3646     selpoint.y = y + term->disptop;
3647     selpoint.x = x;
3648     ldata = lineptr(selpoint.y);
3649     if ((ldata[term->cols] & LATTR_MODE) != LATTR_NORM)
3650         selpoint.x /= 2;
3651
3652     if (raw_mouse) {
3653         int encstate = 0, r, c;
3654         char abuf[16];
3655
3656         if (term->ldisc) {
3657
3658             switch (b) {
3659               case MBT_LEFT:
3660                 encstate = 0x20;               /* left button down */
3661                 break;
3662               case MBT_MIDDLE:
3663                 encstate = 0x21;
3664                 break;
3665               case MBT_RIGHT:
3666                 encstate = 0x22;
3667                 break;
3668               case MBT_WHEEL_UP:
3669                 encstate = 0x60;
3670                 break;
3671               case MBT_WHEEL_DOWN:
3672                 encstate = 0x61;
3673                 break;
3674               default: break;          /* placate gcc warning about enum use */
3675             }
3676             switch (a) {
3677               case MA_DRAG:
3678                 if (term->xterm_mouse == 1)
3679                     return;
3680                 encstate += 0x20;
3681                 break;
3682               case MA_RELEASE:
3683                 encstate = 0x23;
3684                 term->mouse_is_down = 0;
3685                 break;
3686               case MA_CLICK:
3687                 if (term->mouse_is_down == b)
3688                     return;
3689                 term->mouse_is_down = b;
3690                 break;
3691               default: break;          /* placate gcc warning about enum use */
3692             }
3693             if (shift)
3694                 encstate += 0x04;
3695             if (ctrl)
3696                 encstate += 0x10;
3697             r = y + 33;
3698             c = x + 33;
3699
3700             sprintf(abuf, "\033[M%c%c%c", encstate, c, r);
3701             ldisc_send(term->ldisc, abuf, 6, 0);
3702         }
3703         return;
3704     }
3705
3706     b = translate_button(term->frontend, b);
3707
3708     /*
3709      * Set the selection type (rectangular or normal) at the start
3710      * of a selection attempt, from the state of Alt.
3711      */
3712     if (!alt ^ !term->cfg->rect_select)
3713         default_seltype = RECTANGULAR;
3714     else
3715         default_seltype = LEXICOGRAPHIC;
3716
3717     if (term->selstate == NO_SELECTION) {
3718         term->seltype = default_seltype;
3719     }
3720
3721     if (b == MBT_SELECT && a == MA_CLICK) {
3722         deselect(term);
3723         term->selstate = ABOUT_TO;
3724         term->seltype = default_seltype;
3725         term->selanchor = selpoint;
3726         term->selmode = SM_CHAR;
3727     } else if (b == MBT_SELECT && (a == MA_2CLK || a == MA_3CLK)) {
3728         deselect(term);
3729         term->selmode = (a == MA_2CLK ? SM_WORD : SM_LINE);
3730         term->selstate = DRAGGING;
3731         term->selstart = term->selanchor = selpoint;
3732         term->selend = term->selstart;
3733         incpos(term->selend);
3734         sel_spread(term);
3735     } else if ((b == MBT_SELECT && a == MA_DRAG) ||
3736                (b == MBT_EXTEND && a != MA_RELEASE)) {
3737         if (term->selstate == ABOUT_TO && poseq(term->selanchor, selpoint))
3738             return;
3739         if (b == MBT_EXTEND && a != MA_DRAG && term->selstate == SELECTED) {
3740             if (term->seltype == LEXICOGRAPHIC) {
3741                 /*
3742                  * For normal selection, we extend by moving
3743                  * whichever end of the current selection is closer
3744                  * to the mouse.
3745                  */
3746                 if (posdiff(selpoint, term->selstart) <
3747                     posdiff(term->selend, term->selstart) / 2) {
3748                     term->selanchor = term->selend;
3749                     decpos(term->selanchor);
3750                 } else {
3751                     term->selanchor = term->selstart;
3752                 }
3753             } else {
3754                 /*
3755                  * For rectangular selection, we have a choice of
3756                  * _four_ places to put selanchor and selpoint: the
3757                  * four corners of the selection.
3758                  */
3759                 if (2*selpoint.x < term->selstart.x + term->selend.x)
3760                     term->selanchor.x = term->selend.x-1;
3761                 else
3762                     term->selanchor.x = term->selstart.x;
3763
3764                 if (2*selpoint.y < term->selstart.y + term->selend.y)
3765                     term->selanchor.y = term->selend.y;
3766                 else
3767                     term->selanchor.y = term->selstart.y;
3768             }
3769             term->selstate = DRAGGING;
3770         }
3771         if (term->selstate != ABOUT_TO && term->selstate != DRAGGING)
3772             term->selanchor = selpoint;
3773         term->selstate = DRAGGING;
3774         if (term->seltype == LEXICOGRAPHIC) {
3775             /*
3776              * For normal selection, we set (selstart,selend) to
3777              * (selpoint,selanchor) in some order.
3778              */
3779             if (poslt(selpoint, term->selanchor)) {
3780                 term->selstart = selpoint;
3781                 term->selend = term->selanchor;
3782                 incpos(term->selend);
3783             } else {
3784                 term->selstart = term->selanchor;
3785                 term->selend = selpoint;
3786                 incpos(term->selend);
3787             }
3788         } else {
3789             /*
3790              * For rectangular selection, we may need to
3791              * interchange x and y coordinates (if the user has
3792              * dragged in the -x and +y directions, or vice versa).
3793              */
3794             term->selstart.x = min(term->selanchor.x, selpoint.x);
3795             term->selend.x = 1+max(term->selanchor.x, selpoint.x);
3796             term->selstart.y = min(term->selanchor.y, selpoint.y);
3797             term->selend.y =   max(term->selanchor.y, selpoint.y);
3798         }
3799         sel_spread(term);
3800     } else if ((b == MBT_SELECT || b == MBT_EXTEND) && a == MA_RELEASE) {
3801         if (term->selstate == DRAGGING) {
3802             /*
3803              * We've completed a selection. We now transfer the
3804              * data to the clipboard.
3805              */
3806             clipme(term, term->selstart, term->selend,
3807                    (term->seltype == RECTANGULAR));
3808             term->selstate = SELECTED;
3809         } else
3810             term->selstate = NO_SELECTION;
3811     } else if (b == MBT_PASTE
3812                && (a == MA_CLICK
3813 #if MULTICLICK_ONLY_EVENT
3814                    || a == MA_2CLK || a == MA_3CLK
3815 #endif
3816                    )) {
3817         request_paste(term->frontend);
3818     }
3819
3820     term_update(term);
3821 }
3822
3823 void term_nopaste(Terminal *term)
3824 {
3825     if (term->paste_len == 0)
3826         return;
3827     sfree(term->paste_buffer);
3828     term->paste_buffer = NULL;
3829     term->paste_len = 0;
3830 }
3831
3832 int term_paste_pending(Terminal *term)
3833 {
3834     return term->paste_len != 0;
3835 }
3836
3837 void term_paste(Terminal *term)
3838 {
3839     long now, paste_diff;
3840
3841     if (term->paste_len == 0)
3842         return;
3843
3844     /* Don't wait forever to paste */
3845     if (term->paste_hold) {
3846         now = GETTICKCOUNT();
3847         paste_diff = now - term->last_paste;
3848         if (paste_diff >= 0 && paste_diff < 450)
3849             return;
3850     }
3851     term->paste_hold = 0;
3852
3853     while (term->paste_pos < term->paste_len) {
3854         int n = 0;
3855         while (n + term->paste_pos < term->paste_len) {
3856             if (term->paste_buffer[term->paste_pos + n++] == '\015')
3857                 break;
3858         }
3859         if (term->ldisc)
3860             luni_send(term->ldisc, term->paste_buffer + term->paste_pos, n, 0);
3861         term->paste_pos += n;
3862
3863         if (term->paste_pos < term->paste_len) {
3864             term->paste_hold = 1;
3865             return;
3866         }
3867     }
3868     sfree(term->paste_buffer);
3869     term->paste_buffer = NULL;
3870     term->paste_len = 0;
3871 }
3872
3873 static void deselect(Terminal *term)
3874 {
3875     term->selstate = NO_SELECTION;
3876     term->selstart.x = term->selstart.y = term->selend.x = term->selend.y = 0;
3877 }
3878
3879 void term_deselect(Terminal *term)
3880 {
3881     deselect(term);
3882     term_update(term);
3883 }
3884
3885 int term_ldisc(Terminal *term, int option)
3886 {
3887     if (option == LD_ECHO)
3888         return term->term_echoing;
3889     if (option == LD_EDIT)
3890         return term->term_editing;
3891     return FALSE;
3892 }
3893
3894 /*
3895  * from_backend(), to get data from the backend for the terminal.
3896  */
3897 int from_backend(void *vterm, int is_stderr, char *data, int len)
3898 {
3899     Terminal *term = (Terminal *)vterm;
3900
3901     assert(len > 0);
3902
3903     bufchain_add(&term->inbuf, data, len);
3904
3905     /*
3906      * term_out() always completely empties inbuf. Therefore,
3907      * there's no reason at all to return anything other than zero
3908      * from this function, because there _can't_ be a question of
3909      * the remote side needing to wait until term_out() has cleared
3910      * a backlog.
3911      *
3912      * This is a slightly suboptimal way to deal with SSH2 - in
3913      * principle, the window mechanism would allow us to continue
3914      * to accept data on forwarded ports and X connections even
3915      * while the terminal processing was going slowly - but we
3916      * can't do the 100% right thing without moving the terminal
3917      * processing into a separate thread, and that might hurt
3918      * portability. So we manage stdout buffering the old SSH1 way:
3919      * if the terminal processing goes slowly, the whole SSH
3920      * connection stops accepting data until it's ready.
3921      *
3922      * In practice, I can't imagine this causing serious trouble.
3923      */
3924     return 0;
3925 }
3926
3927 void term_provide_logctx(Terminal *term, void *logctx)
3928 {
3929     term->logctx = logctx;
3930 }